You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My business trip has been postponed.Can you please help me for changing the existing reservation?

ASSISTANT: Sure, I will help with that.

USER: Thank you.

ASSISTANT: May I know your name to check the reservation details?

USER: Sure, my name is Justin Thomas.

ASSISTANT: I searched with your name, but I did not get any reservation.

USER: Ok, no problem. I will search another flight. Thank you for your information.

ASSISTANT: It's my pleasure, have a great day.