You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my reservation, as my business meeting has been postponed. Can you please help me with that?

ASSISTANT: Please may I know your name?

USER: Sure, my name is Barbara Carter.

ASSISTANT: Please wait a while, I will check and inform you.

USER: Sure, take your own time.

ASSISTANT: Sorry to say, 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.