A recepcionista disse que a reserva da senhora já está confirmada.

No. Recepcionista can refer to either a male or a female receptionist. The article shows the gender:

• a recepcionista = the female receptionist
• o recepcionista = the male receptionist

This is common with some professions in Portuguese: the noun stays the same, but the article changes.

Disse is the past tense of dizer, which means to say or to tell.

So:

• dizer = to say / to tell
• disse = said

In this sentence, A recepcionista disse... means The receptionist said...

This is a very common irregular verb, so disse does not look much like dizer.

Que here means that and introduces the content of what was said.

• A recepcionista disse que... = The receptionist said that...

Just like in English, that can sometimes be omitted in translation, but in Portuguese que is normally kept in this structure.

Da senhora literally means of the lady, but in real usage it usually means your, when speaking politely to a woman.

So:

• a reserva da senhora = your reservation, said politely/formally to a woman

Grammatically, da is a contraction of:

• de + a = da

So literally it is the reservation of the lady, but the natural meaning is your reservation, ma’am.

Both are possible, but a reserva da senhora is often clearer and more polite in customer-service situations.

Why not just sua reserva?

Because seu/sua can sometimes be ambiguous in Portuguese. It might mean:

• your
• his
• her

So a reserva da senhora avoids confusion and sounds polite and professional.

In places like hotels, clinics, and stores, forms like o senhor and a senhora are very common.

Senhora means lady, madam, or ma’am, depending on context.

It is the feminine polite form used to address an adult woman respectfully.

Related forms:

• senhor = sir / Mr.
• senhora = ma’am / Mrs. / Ms. in polite address

In Brazil, this can sound respectful, formal, or sometimes simply standard in service situations.

Já está confirmada focuses on the current state: the reservation is already confirmed.

• está confirmada = is confirmed / is in a confirmed state
• foi confirmada = was confirmed

So the difference is roughly:

• já está confirmada = it is already confirmed now
• já foi confirmada = it was confirmed earlier

In this sentence, the speaker is telling the customer the present status of the reservation, so está confirmada is very natural.

Because it agrees with reserva, which is a feminine singular noun.

• a reserva = feminine singular
• confirmada = feminine singular form of confirmado

This is a very important feature of Portuguese: adjectives and many past participles used adjectivally agree with the noun.

Compare:

• o quarto está confirmado = the room is confirmed
• a reserva está confirmada = the reservation is confirmed

Because the act of speaking happened in the past, but the reservation’s status is true in the present.

So:

• disse = the receptionist said
• está confirmada = the reservation is confirmed now

This is completely normal. English does the same thing:

• The receptionist said that your reservation is already confirmed.

Portuguese does not need to shift everything into the past just because the reporting verb is in the past.

Já here means already.

• já está confirmada = is already confirmed

It often comes before the verb, as in this sentence, but its position can vary a little depending on emphasis and style.

Common patterns:

• já está confirmada
• está já confirmada — less common in everyday Brazilian Portuguese

The version in your sentence is the most natural and standard.

Sometimes, but disse is better here.

• dizer = to say / to tell
• falar = to speak / to talk

In reported speech, disse que... is very common and natural:

• Ela disse que... = She said that...

Falou que... can exist in informal speech, especially in Brazil, but disse que... is more standard and more appropriate in this kind of sentence.

In sentences like this, learners can think of it as describing a state.

• A reserva está confirmada = The reservation is confirmed

Historically, it is related to the past participle of the verb confirmar, but in use it behaves very much like an adjective:

• confirmado / confirmada

That is why it agrees with the noun:

• o pedido está confirmado
• a reserva está confirmada

So the most useful way to understand it is: estar + past participle often expresses a resulting state.

A less formal version might be:

• A recepcionista disse que sua reserva já está confirmada.

This is more direct and a little less formal than a reserva da senhora.

But in hotels, clinics, offices, and other service contexts, the original sentence sounds very natural because it is polite and professional.