You are a flight assistant. 
 USER: hi.

ASSISTANT: Hello.

USER: I am Charles Carter, I wnat to cancel my recent reservation. Help me with it.

ASSISTANT: Ok, sure may I know your name?

USER: I have already mentioned.

ASSISTANT: Sorry, I did not find any reservation on your name to cancel.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us.