În cazul în care lipsește actul de identitate, așteptăm.

Yes. În cazul în care is a fixed expression meaning if, in case, or in the event that.

Literally, it is something like in the case in which, so it sounds more formal and administrative than plain dacă.

This kind of phrase is very common in official Romanian:

• În cazul în care aveți întrebări... = If you have questions...
• În cazul în care lipsește actul... = If the document is missing...

Yes, in many situations you could.

• În cazul în care lipsește actul de identitate, așteptăm.
• Dacă lipsește actul de identitate, așteptăm.

Both are grammatical, but they do not sound exactly the same:

• dacă = the normal, everyday way to say if
• în cazul în care = more formal, more bureaucratic, more written

So a native speaker would often choose dacă in conversation, but în cazul în care fits very well in instructions, notices, or official language.

Not in this sentence.

In Romanian, act often means document, especially an official one. So act de identitate means identity document / ID document.

That is different from English act meaning deed, action, or part of a play.

So here:

• act = document
• act de identitate = identity document
• actul de identitate = the identity document / the ID document

Because Romanian usually puts the definite article at the end of the noun.

So:

• act = a document
• actul = the document

This ending -ul is the masculine/neuter singular definite article.

In this sentence, actul de identitate means the identity document, not just an identity document.

Because in this type of Romanian noun phrase, usually only the first noun gets the article.

Structure:

• act de identitate = identity document
• actul de identitate = the identity document

The second noun after de often stays unarticulated:

• carte de vizită = business card
• sală de sport = gym
• act de identitate = identity document

So de identitate works like a descriptive complement: it tells you what kind of document it is.

Here lipsește means is missing.

It comes from the verb a lipsi. In different contexts, a lipsi can mean:

• to be missing
• to be absent
• sometimes to lack in certain structures

In this sentence:

• lipsește actul de identitate = the ID document is missing

So the document is the thing that is absent.

Because the subject is singular: actul de identitate.

The verb a lipsi in the present tense goes like this:

• eu lipsesc
• tu lipsești
• el/ea lipsește
• noi lipsim
• voi lipsiți
• ei/ele lipsesc

Since actul de identitate is singular, Romanian uses the 3rd person singular form:

• lipsește

Romanian word order is more flexible than English word order.

Both of these are possible:

• lipsește actul de identitate
• actul de identitate lipsește

The version with the verb first is very natural in Romanian, especially in formal or informational language. It can sound slightly more neutral or procedural.

English is much stricter, so we normally say:

• the ID document is missing

But Romanian can comfortably put the verb first without sounding strange.

Așteptăm is the 1st person plural form of a aștepta = to wait.

So literally it means:

• we wait
• depending on context, also we are waiting or we will wait

In official or institutional language, this we often refers to the staff, office, or institution, not necessarily a specific group of named people. Romanian uses this kind of we quite naturally in formal settings.

So așteptăm does not mean wait! If you wanted an imperative, you would say:

• așteaptă! = wait! to one person, informal
• așteptați! = wait! to one person polite or to several people

Romanian often uses the present tense in situations where English might use either present or future, depending on context.

So așteptăm can mean:

• we wait
• we are waiting
• we will wait

The exact time reference comes from context, not only from the verb form.

That is very normal in Romanian, especially in instructions, procedures, and conditional statements.

Because În cazul în care lipsește actul de identitate is a subordinate clause, and it comes before the main clause.

Romanian normally separates this kind of introductory conditional clause with a comma:

• În cazul în care..., așteptăm.

So the comma marks the boundary between:

• the condition: În cazul în care lipsește actul de identitate
• the main statement: așteptăm

This is standard Romanian punctuation.