You are a flight assistant. 
 USER: HI, I am David Lewis.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please help me with cancelling my recent reservation?

ASSISTANT: Sure, please wait a moment I will check the reservation list.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found on this name.

USER: Ok, no problem.

ASSISTANT: Thanks for availing us.

USER: Thanks for the help.