You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Could you please help me to cancel my reservation?

ASSISTANT: Sure, may I know you name please?

USER: My name is Charles Parker.

ASSISTANT: Please give me a moment.

USER: Sure.

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

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for choosing us.