Ako budete imali problem u hotelu, pozovite recepciju.

Budete imali is the Future II form, and it is very common in Serbian after ako when you are talking about a possible situation in the future.

So:

• Ako budete imali problem... = If you have a problem... / If you happen to have a problem...
• Ako imate problem... can also be correct, but it sounds more general or less specifically future-oriented.

In this sentence, the speaker is giving instructions for a future situation, so budete imali is the most natural choice.

It is the 2nd person plural / formal singular Future II of imati (to have).

It is made from:

• budete = a form of biti
• imali = the l-participle of imati

This matches vi, which in Serbian can mean:

• you all
• or you in a polite/formal singular sense

So budete imali literally corresponds to something like you will have had, but in real usage here it simply means if you have in a future condition.

Pozovite is the imperative form of pozvati for vi.

It means:

• call! when speaking politely to one person
• or call! when speaking to more than one person

Since this sentence gives an instruction, the imperative is exactly what Serbian uses.

Compare:

• pozovi = call! (informal singular)
• pozovite = call! (plural or polite singular)

So this sentence is addressing the listener politely or as a group.

It can be either.

In Serbian, vi forms are used for:

• plural you = talking to multiple people
• formal/polite singular you = talking respectfully to one person

Because both budete imali and pozovite are vi forms, the sentence could mean either:

• instructions to hotel guests in general
• or polite instructions to one guest

You can only know from context.

Because recepciju is in the accusative case, which is used for the direct object of pozvati (to call).

Base form:

• recepcija = reception, front desk

Accusative singular:

• recepciju

So:

• pozovite recepciju = call the reception / call the front desk

This is a very common feminine noun pattern:

• soba → sobu
• rezervacija → rezervaciju
• recepcija → recepciju

Because u hotelu expresses location: in the hotel.

After u, Serbian uses different cases depending on meaning:

• u + locative = in / at a place
• u + accusative = into a place, movement toward the inside

Here there is no movement, just location, so we get:

• hotel → u hotelu

Compare:

• Ja sam u hotelu. = I am in the hotel.
• Idem u hotel. = I am going into the hotel / to the hotel.

Because Serbian often uses the singular for a problem in this kind of practical instruction.

So Ako budete imali problem... means If you have a problem...

You could also hear other expressions depending on context, for example:

• ako bude problema = if there are problems / if there is trouble
• ako imate neki problem = if you have some problem

But problem in the singular is very natural here because the sentence is referring to any individual issue the guest may have.

Yes. That would also be natural.

• Ako budete imali problem... = If you have a problem...
• Ako budete imali neki problem... = If you have some problem / any problem...

Adding neki can make the sentence sound a little more explicit or a little closer to English any/some, but it is not necessary. Serbian often leaves it out where English might include it.

Because Serbian has no articles like English a/an/the.

Whether something is definite or indefinite is usually understood from context.

So:

• u hotelu can mean in the hotel
• recepciju can mean the reception/front desk

In this sentence, the context makes it clear that it means the hotel’s reception/front desk, so Serbian does not need a separate word like the.

No. Pozvati means to call.

So pozovite recepciju means:

• call the reception
• call the front desk
• contact the reception desk by phone

If you wanted to say go to reception, Serbian would use a different verb, for example:

• Idite na recepciju. = Go to reception.
• Obratite se recepciji. = Contact / speak to reception.

So pozvati specifically means calling, not walking there.

Yes, Serbian word order is fairly flexible, although some versions sound more natural than others.

The original sentence:

• Ako budete imali problem u hotelu, pozovite recepciju.

Other possible versions:

• Ako u hotelu budete imali problem, pozovite recepciju.
• Pozovite recepciju ako budete imali problem u hotelu.

These all mean basically the same thing. The original version is a very natural, neutral way to say it.

Word order in Serbian often changes for:

• emphasis
• rhythm
• style
• what information is already known

Yes. Pozvati is a perfective verb.

That fits well here because the instruction is about a single complete action:

• call the reception

Its imperfective partner is usually pozivati, which would suggest repeated or ongoing calling in the right context.

In an instruction like this, Serbian normally prefers the perfective imperative:

• pozovite = call

because it tells someone to perform one complete action when needed.

Yes. If you were speaking to one person informally, you would usually change the vi forms to ti forms:

• Ako budeš imao problem u hotelu, pozovi recepciju.
  (to a man)

• Ako budeš imala problem u hotelu, pozovi recepciju.
  (to a woman)

Notice that in the informal singular, the l-participle agrees with the gender of the person:

• imao for masculine
• imala for feminine

In the original sentence, imali is the vi form, so gender does not show up.