You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My interview got postponed, so I want to change my reservation.

ASSISTANT: Sure, I will help you out. May I know your name please?

USER: My name is Carol Harris.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there are no reservations found.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.