Máme rezervaci na sedm hodin, ale obsluha říká, že můžeme přijít i o něco dřív.

With things like appointments, bookings, and reservations, Czech very often uses na + time:

rezervace na sedm hodin = a reservation for seven o’clock

This is a very common pattern:

• objednat se na tři = to book an appointment for three
• máme stůl na osm = we have a table for eight o’clock

V sedm hodin means at seven o’clock in a more general time sense. It tells you when something happens, but na sedm hodin is especially natural for something scheduled or booked.

Because rezervaci is the accusative singular form of rezervace.

The verb mít usually takes a direct object in the accusative:

• Máme rezervaci. = We have a reservation.
• dictionary form: rezervace
• accusative singular: rezervaci

This is a normal pattern for feminine nouns ending in -e:

• informace → informaci
• stanice → stanici

After numerals 5 and higher, Czech typically uses the genitive plural of the noun.

So:

• jedna hodina
• dvě hodiny
• tři hodiny
• čtyři hodiny
• pět hodin
• sedm hodin

That is why you get sedm hodin.

Also, in everyday speech, Czechs often shorten this and simply say:

• Máme rezervaci na sedm.

Obsluha means the staff, the server, or the service personnel, depending on context.

In a restaurant context, it often refers to the person serving you, or more generally the front-of-house staff.

A useful thing to notice: although English may translate it as the staff, Czech treats obsluha as a singular noun, so the verb is singular too:

• obsluha říká = the staff/server says

Not:

• obsluha říkají

Že means that and introduces a subordinate clause.

So:

• obsluha říká = the staff says
• že můžeme přijít i o něco dřív = that we can come a bit earlier too

This is the normal Czech way to report what someone says, thinks, knows, etc.:

• Říká, že přijde. = He/She says that he/she will come.
• Myslím, že má pravdu. = I think that he/she is right.

Also note the comma before že. Czech writes commas before subordinate clauses much more consistently than English does.

After a modal verb like moci (can / be able to), Czech uses an infinitive.

So:

• můžeme = we can
• přijít = to come / to arrive

Together:

• můžeme přijít = we can come

This is the same pattern as:

• musím odejít = I must leave
• chci jít = I want to go
• nemůžu čekat = I can’t wait

Přijít is perfective, while přicházet is imperfective.

Here, the sentence talks about arriving at a particular time, as a single completed event:

• můžeme přijít dřív = we can come/arrive earlier

That is why přijít sounds natural.

If you used přicházet, it would suggest repeated or ongoing coming, which does not fit as well here.

Very roughly:

• přijít = to arrive / to come once
• přicházet = to be coming / to come repeatedly or in progress

Here i means something like also, too, or even.

So:

• můžeme přijít i o něco dřív = we can also come a little earlier / we can come a bit earlier too

It adds the idea that seven o’clock is fine, but an earlier time is acceptable as well.

Compare:

• Můžeme přijít dřív. = We can come earlier.
• Můžeme přijít i dřív. = We can come earlier too / even earlier.

Literally, o něco means by something or by a little amount, and with a comparative it often means a bit or somewhat.

So:

• dřív = earlier
• o něco dřív = a bit earlier / somewhat earlier

You will see this pattern a lot:

• o něco lepší = a bit better
• o něco větší = a little bigger
• o něco později = a little later

It is a very useful structure.

Both are correct.

• dřív is more common in everyday spoken Czech
• dříve is a bit more formal or bookish

So in normal conversation:

• přijít dřív sounds very natural

You could also say:

• můžeme přijít i o něco dříve

but it sounds slightly more formal.

Yes, very often.

In everyday Czech, speakers frequently omit hodin when the meaning is obvious:

• Máme rezervaci na sedm.

This is probably the most natural colloquial version.
The full na sedm hodin is also correct; it is just a little more explicit.

Czech punctuation requires both here.

1. Before ale
   The sentence joins two main clauses:
   • Máme rezervaci na sedm hodin
   • obsluha říká...

These are linked by ale = but, so a comma is used.

2. Before že
   Že introduces a subordinate clause:
   • že můžeme přijít i o něco dřív

In Czech, subordinate clauses are normally separated by commas.

So the punctuation is completely standard: Máme rezervaci na sedm hodin, ale obsluha říká, že můžeme přijít i o něco dřív.

Yes. Czech word order is flexible, although the original version is very natural.

The given sentence presents the situation first, then the contrast:

• Máme rezervaci na sedm hodin, ale obsluha říká...

You could also hear:

• Obsluha ale říká, že můžeme přijít i o něco dřív.
• Máme rezervaci na sedm, ale říkají, že můžeme přijít i dřív.

The exact word order changes the emphasis a little, but not the core meaning.

The original sentence is a good, neutral way to say it.