You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kenneth Clark.

ASSISTANT: How may I aid you today?

USER: I had planned to go on a vacation, but it was cancelled due to some reasons. I am looking for cancel of my recent reservation. Can you help me out?

ASSISTANT: Sorry Clark, there is no reservation found basis on your name.

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

ASSISTANT: Welcome.