Hello. I am Gary Hill.
user
Hello. How can I help you?
assistant
I need to change my recent reservation due to postpone of my family get to gether. Could you please help me in doing that?
user
Ok, please wait.
assistant
Sure.
user
We found reservation on your name, could you provide me your new journey details?
assistant
Sure, My new travelling dates are 03/21 and return on 03/23. My new airport codes are SFO and EWR.
user
Ok, please wait.
assistant
Sure.
user
 Sorry, no flights are available on your requested dates.
assistant
No problem, thank you for your information.
user
 Thank  you for availing us.
assistant