You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, may I know your good name please?

USER: Myself James Johnson.

ASSISTANT: Please be on hold, I'll check for your reservation status.

USER: Ok.

ASSISTANT: There is no reservation found under your name to do changes in that.

USER: Ok, fine. Thank you for checking my status.

ASSISTANT: Thank you for choosing us.