You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am looking to change my travel dates because my trip got postponed. Can you please help me?

ASSISTANT: Sure, I will help you in changing your reservation.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Katherine Jones.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no reservations found.

USER: That's ok, not a problem. Anyways thank you for spending your time.

ASSISTANT: Thank you for choosing us.