You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to cancel my reservation, can you please help me?

ASSISTANT: Sure, may I know your name please?

USER: My name is Charles Martin.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: There is no reservation found with your given name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you.