Phrases Phrases for Making Reservations

Could I confirm my reservation?

Meaning

Can I check if my reservation is still valid?

Translation language

John: Hello, I have a reservation for tomorrow.
Alice: Certainly, sir. <b>Could I confirm your reservation</b>?
John: Yes, please.
Alice: One moment, please... Yes, it's confirmed. <b>Could I confirm your reservation</b> details once again for accuracy?