You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to cancel my recent reservation. Could you help me with that?

ASSISTANT: Sure, may I know your name to check your reservation from our data base?

USER: Charles Lewis.

ASSISTANT: We regret to inform you that there is no active reservation found on your name to cancel.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.