You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

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

ASSISTANT: For cancelling the reservation, May I know your name?

USER: Myself Jason Roberts.

ASSISTANT: Just a moment.

USER: Sure.

ASSISTANT: Roberts sorry to intimate, no reservation is found on your name in our database.

USER: No problem, thanks for checking.

ASSISTANT: You are welcome.