You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: I am Donald Perez.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: I could not find any reservation on your name.

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

ASSISTANT: Thank you for approaching us.