You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to cancel my reservation, so please help me in the cancellation.

ASSISTANT: Sure, I am here to help you out. May I know your name please?

USER: Myself David Jackson.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: David Jackson, we haven't found any reservation under your name in our database.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for choosing us.