You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Larry Campbell here. I need to cancel my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your own time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

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

ASSISTANT: You are welcome.