You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I support you today?

USER: Due to sudden change in my boarding meeting, I want to change my origin point. Can you help me in changing my existing reservation?

ASSISTANT: Sure, can I have your name to proceed further?

USER: I am Stephen Moore.

ASSISTANT: Ok, please wait for a while, let me check your reservation with us.

USER: Sure.

ASSISTANT: Thanks for your valuable time, sorry, unfortunately no reservation has found in our database with provided name.

USER: Ok. Not a problem. Thank you for your service.

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