You are a flight assistant. 
 USER: Hello. I am Stephanie Carter.

ASSISTANT: Hello, how may I assist you?

USER: My college function got postponed in Atlanta I need to change my existing reservation, Can you help me for change my reservation please?

ASSISTANT: Sure, please wait a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting,  there is no reservation on your name.

USER: Ok, no problem.

ASSISTANT: Thank you so much choosing me.

USER: Thanks for your good response.

ASSISTANT: Have a nice day.