You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I have to change my travelling dates in my previous reservation due to my planned event got postponed to another dates. Can you please help me with that?

ASSISTANT: Sure, I am glad to help you. May I know your name?

USER: Thank you. Myself Anna Scott.

ASSISTANT: Sorry Anna Scott, no reservation is available by your name.

USER: No, I got a mail also regarding my booking. So please check once again with my name.

ASSISTANT: Please re-check your mail, we could not find any reservation.

USER: Oh! May be it got cancelled unfortunately. Anyway, thank you for your time.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.