You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I oblige you today?

USER: Can you please help me in changing my reservation as my plan to go for the historical trip got postponed?

ASSISTANT: Sure, on what name ticket has been reserved?

USER: It was done by the name Angela Scott.

ASSISTANT: Please wait for couple of minutes.

USER: Sure, I will.

ASSISTANT: Sorry, we couldn't find a reservation on your name to change.

USER: Ok fine, thanks for checking.

ASSISTANT: Thank you for contacting us.