You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Amanda Taylor want to change my reservation due to prepone of my meeting with clients. Can you help me in changing?

ASSISTANT: Please wait a while, I will check and inform you.

USER: Ok.

ASSISTANT: There is a reservation on your name, can you please share your desired travel dates?

USER:  My travel dates are 12/31 and 01/01.

ASSISTANT: May I know your preferred airport codes please?

USER: I will depart to GA-ATL from TX-IAH.

ASSISTANT: Wait a While.

USER: Ok.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, not a problem.

ASSISTANT: Thank you for opting us.

USER:  Thank you for availing me.