Masa pemesanan kamar itu belum ditemukan, padahal saya sudah menerima email reservasi kemarin?

Here masa is most likely a colloquial particle of surprise or disbelief, not the noun meaning period / era / time.

In this sentence, it works like:

• How come ...?
• Really?
• Can it be that ...?

So Masa pemesanan kamar itu belum ditemukan...? has the feeling of a complaint or disbelief: the speaker thinks this situation should not be happening.

Because Indonesian noun phrases usually put the main noun first and the describing word after it.

So:

• pemesanan kamar = booking of a room / room booking
• email reservasi = reservation email

The pattern is often:

• head noun + modifier

This is different from English, where the modifier often comes first, as in room booking.

Itu makes the noun phrase more specific. It can mean something like:

• that
• the one we’re talking about
• sometimes just a marker of definiteness

So pemesanan kamar itu means something like that room booking or the room booking in question.

It suggests the speaker and listener already know which booking is being discussed.

Belum means not yet, while tidak is a more general not.

So:

• belum ditemukan = has not been found yet
• tidak ditemukan = was not found / is not found

Using belum implies that the booking may still be found later. It fits well in a situation where staff are still searching for it.

That is why belum sounds more natural here.

Ditemukan is the passive form, meaning to be found.

• menemukan = to find
• ditemukan = to be found

So:

• Pemesanan kamar itu belum ditemukan = The room booking has not been found yet

If you used menemukan, you would normally need to say who is doing the finding:

• Staf belum menemukan pemesanan kamar itu = The staff have not found that room booking yet

The passive is very common in Indonesian when the speaker wants to focus on the thing affected, not on the person doing the action.

Padahal introduces a contrast between what actually happened and what should logically be true.

Here it means something like:

• even though
• whereas
• but the thing is
• and yet

So the logic is:

• I already received the reservation email yesterday,
• and yet the booking still cannot be found.

It adds a strong feeling of frustration or contradiction.

Because kemarin and sudah do different jobs.

• kemarin = tells you when it happened: yesterday
• sudah = tells you the action was already completed

So:

• saya menerima email reservasi kemarin = I received the reservation email yesterday
• saya sudah menerima email reservasi kemarin = I had already received the reservation email yesterday / I already received it yesterday

In English, already is sometimes optional in translation, but in Indonesian sudah helps emphasize completion.

Because Indonesian does not usually change word order the way English does to form questions.

English often does this:

• You found it.
• Did you find it?

Indonesian often keeps normal statement order and uses:

• intonation
• question marks
• question words or particles

In this sentence, the questioning tone comes mainly from:

• masa at the beginning
• the final question mark
• the context of disbelief

So the sentence structure can stay statement-like while still being clearly understood as a question.

Yes, it is understandable and fairly natural, especially in modern Indonesian where English loanwords are common.

But depending on context, speakers might also say:

• email konfirmasi reservasi
• email konfirmasi pemesanan
• email booking in very casual usage

So email reservasi is fine, but it is slightly broad. If you want to be more precise, email konfirmasi reservasi may sound clearer.

They are very close in meaning here, but there is a slight nuance.

• pemesanan comes from pesan and means ordering / booking
• reservasi is a loanword meaning reservation

In hotel and travel contexts, they often overlap. But:

• pemesanan kamar sounds like the act of booking the room
• reservasi can sound a bit more like the formal reservation record or reservation status

That is why both can appear in the same sentence without sounding strange:

• pemesanan kamar = the room booking
• email reservasi = the reservation email / reservation confirmation email

It is mostly conversational, especially because of masa.

The rest of the sentence is fairly neutral, but masa gives it a spoken, emotional tone. It sounds like a customer expressing surprise or annoyance.

A more formal version might be something like:

• Bagaimana mungkin pemesanan kamar itu belum ditemukan, padahal saya sudah menerima email reservasi kemarin?

That sounds more formal and less colloquial.