You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Dennis Davis.

ASSISTANT: In which way I can assist you?

USER: I had planned to go on a vacation, but it was cancelled.Can you cancel my recent reservation?

ASSISTANT: Sure, I will help you with cancelling your reservation. Please wait a moment, I will check the existing reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry Davis, there is no reservation has found under your name to cancel.

USER: That's ok.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.

ASSISTANT: You are welcome. Have a good day.