Hi.
user
Hello. How may I aid you?
assistant
I want to change my reservation due to health problem, can you help me?
user
Sure, I will help you with the change of flight reservation.
assistant
Thank you.
user
May I know your name please?
assistant
Myself Nicholas Martin.
user
I found your flight reservation. Can you tell me your travel dates?
assistant
My travel dates are 10/12 and 10/14.
user
Ok, now please let me know your airport codes?
assistant
My airport codes are from PHX to DCA.
user
Thanks for waiting. But I am sorry to say that presently there are no flights available.
assistant
No problem, thanks for checking.
user
Thank you.
assistant