You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, may I know your name please?

USER: Rebecca Lee.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Rebecca Lee, we haven't found nay reservation under your name in our database.

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

ASSISTANT: Thank you for choosing us.