You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, May I know your name please?

USER: I am Robert Collins.

ASSISTANT: Hello, Robert Collins, how can I help you?

USER: My friend birthday party place has been changed to Atlanta. Can you please change my existing reservation?

ASSISTANT: Ok, please wait for a minute. I will revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Ok, no problem.

ASSISTANT: Thanks for your interest on us.

USER: Thanks for the help.

ASSISTANT: Have a great day.