You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my existing reservation. Can you help me in that?

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

USER: Thank you, myself George Brown.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.