You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you today?

USER: I want to change my existing reservation due to a sudden visitation purpose at my friends house.

ASSISTANT: Sure, May I know your name please?

USER: Will you help me out? I am George Miller.

ASSISTANT: Sure, give me a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, but there is no reservation.

USER: Ok, no problem. Thank you for assisting me.

ASSISTANT: Thanks for choosing us, have a good day.