You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My trip was postponed so can you please change my travel dates in my previous reservation?

ASSISTANT: Yes, can you tell me your name?

USER: Thank you, I have done it on the name of Raymond Allen.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Oh! I think I have done a wrong reservation.

ASSISTANT: Thank you for contacting us.

USER: Thank you for the information.