You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I'm Christopher Anderson. My business meeting has been postponed. So, I would like to change my reservation.

ASSISTANT: Sure, I will help you. Please wait a while.

USER: Sure, take your time.

ASSISTANT: There is no reservation on your name in our database.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for opting us.

USER: You are welcome.