You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Jack Carter.

ASSISTANT: Carter, how can I help you today?

USER: My business meeting has been postponed. So, I would like to change my existing reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure. Carter, but no reservations with your name.

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

ASSISTANT: Thank you for contacting us. Have a good day.