Jestli je v restauraci místo, nepotřebujeme další rezervaci.

Here jestli means if.

It introduces a subordinate clause:

• Jestli je v restauraci místo = If there is room in the restaurant

A useful note: jestli can also mean whether in other sentences, especially in indirect questions:

• Nevím, jestli přijde. = I don’t know whether he will come.

In this sentence, though, the meaning is clearly conditional: if.

Jestli is very common and natural in everyday Czech.

Other possible words are:

• když = if/when in many everyday situations
• pokud = if, often a bit more formal
• jestliže = if, more formal or literary

So this sentence could also appear as:

• Pokud je v restauraci místo, nepotřebujeme další rezervaci.

But jestli is completely normal in speech and informal writing.

Because Jestli je v restauraci místo is a subordinate clause, and Czech normally separates subordinate clauses from the main clause with a comma.

So the structure is:

• Jestli je v restauraci místo, = subordinate clause
• nepotřebujeme další rezervaci. = main clause

This is standard Czech punctuation.

Because the subject is místo, which is singular.

• místo = place / room / space / seat
• It is a singular neuter noun.
• Therefore the verb is also singular: je = is

If the subject were plural, you would use jsou:

• Jestli jsou v restauraci volná místa... = If there are free places/seats in the restaurant...

Here místo does not mean just place in a general sense. In this context it means room, space, or an available seat/table capacity.

So je v restauraci místo means something like:

• there is room in the restaurant
• the restaurant has space
• there is an available place

Czech often uses místo this way in restaurants, cars, trains, etc.

Because the preposition v means in, and after v you usually need the locative case when talking about location.

The noun is:

• restaurace = restaurant

Its locative singular form is:

• v restauraci = in the restaurant

So:

• restaurace = base form
• v restauraci = location after v

Because Czech has no articles.

English distinguishes:

• a restaurant
• the restaurant

Czech usually just says:

• restaurace
• v restauraci

The exact meaning is understood from context.

So v restauraci can mean:

• in a restaurant
• in the restaurant

Likewise:

• další rezervaci can mean another reservation without needing an article.

In Czech, verbal negation is usually formed by adding ne- directly to the verb.

So:

• potřebujeme = we need
• nepotřebujeme = we do not need

This is the normal pattern:

• mám → nemám
• chci → nechci
• rozumíme → nerozumíme

So ne is not usually written separately from the verb.

Because rezervaci is the accusative singular form, and it is the direct object of potřebujeme / nepotřebujeme.

The base form is:

• rezervace = reservation

After potřebovat (to need), you normally use the accusative:

• potřebujeme rezervaci
• nepotřebujeme další rezervaci

So:

• rezervace = dictionary form, nominative
• rezervaci = accusative singular

Here další means another or an additional.

So další rezervaci means:

• another reservation
• an extra reservation
• an additional booking

In other contexts, další can also mean next:

• další den = the next day

The exact meaning depends on context.

Yes. Czech word order is more flexible than English, although different orders can change emphasis.

The given version is very natural:

• Jestli je v restauraci místo, nepotřebujeme další rezervaci.

You could also say:

• Nepotřebujeme další rezervaci, jestli je v restauraci místo.

That still makes sense, but it may sound a bit less neutral because the main point comes first.

In Czech, word order often reflects focus and emphasis, not just grammar.

It is neutral to slightly informal, mainly because of jestli.

It is perfectly normal in everyday Czech. If you wanted a more formal style, you might use:

• Pokud je v restauraci místo, nepotřebujeme další rezervaci.
• Jestliže je v restauraci místo, nepotřebujeme další rezervaci.

But the original sentence is absolutely standard and natural.

Not exactly.

• další rezervaci = another / an additional reservation
• jinou rezervaci = a different reservation

So the original sentence says:

• we do not need one more reservation

If you said jinou rezervaci, it would suggest replacing the reservation with a different one, not simply adding one more.