Confirm rezervarea azi.

Because Romanian often drops the subject pronoun when it is clear from the verb form.

• confirm = I confirm
• so eu is not necessary

You can still say Eu confirm rezervarea azi if you want to emphasize I specifically, for example in contrast with someone else.

Confirm is the 1st person singular present tense of a confirma (to confirm).

So:

• (eu) confirm = I confirm
• (tu) confirmi = you confirm
• (el/ea) confirmă = he/she confirms

In this sentence, confirm tells you the subject is I.

Not all Romanian verbs ending in -a use the -ez pattern.

A confirma is conjugated like this:

• eu confirm
• tu confirmi
• el/ea confirmă

So confirm is the correct form. A learner may expect -ez, but that only happens with certain verbs, not all of them.

Because rezervarea means the reservation, while rezervare means just reservation as a general noun.

Romanian usually puts the definite article at the end of the noun:

• rezervare = reservation
• rezervarea = the reservation

So the ending -a here functions like English the.

Romanian usually uses a suffix article, not a separate word like English.

Compare:

• English: the reservation
• Romanian: rezervarea

This is a very common feature of Romanian nouns. The article is attached directly to the end of the noun.

No. You would normally say Confirm rezervarea, not Confirm pe rezervarea.

In Romanian, pe is often used before specific people or certain pronouns as direct objects, but not usually before an inanimate thing like rezervarea.

So:

• Văd Maria often becomes O văd pe Maria
• but Confirm rezervarea stays exactly like that

Yes. Azi and astăzi both mean today.

The difference is mostly style:

• azi = shorter, very common in everyday speech
• astăzi = also common, sometimes a bit more formal or fuller-sounding

So Confirm rezervarea azi and Confirm rezervarea astăzi both work.

No, Romanian word order is fairly flexible.

Confirm rezervarea azi is natural, but you can also say:

• Azi confirm rezervarea
• Confirm azi rezervarea

These versions all mean basically the same thing, but the emphasis changes slightly:

• Azi confirm rezervarea puts more focus on today
• Confirm rezervarea azi sounds neutral and straightforward

Yes. Romanian present tense can often correspond to both:

• I confirm
• I am confirming

So depending on context, Confirm rezervarea azi could be understood in either way in English. Romanian does not need a separate continuous form here.

Yes, it is correct.

Adding eu makes the subject explicit:

• Confirm rezervarea azi = neutral
• Eu confirm rezervarea azi = I confirm the reservation today

The version with eu is often used for emphasis, contrast, or clarity, but it is not required.