You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm David Taylor.

ASSISTANT: How can I aid you for this day?

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

ASSISTANT: Ok, sure can you please wait moment to check for further details. Sorry no reservation found on your name.

USER: That's Ok. Thank you for your help.

ASSISTANT: You are welcome.