You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please change my recent reservation? As my planned trip has been postponed to some other dates.

ASSISTANT: Sure, I am here to help you out.

USER: Thanks for that.

ASSISTANT: May I know your name please?

USER: Sure, my name is Gary Walker.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Gary Walker, we haven't found any reservation under your name in our database.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for choosing us.