Hi.
user
Hello. How may I help you at this moment?
assistant
I want to change an existing reservation due to sudden change in my trip Can you help me?
user
Sure, I am here to help you with that.
assistant
Thank you.
user
May I know your name?
assistant
Eric Robinson.
user
I have found the reservation, may I know your airport codes?
assistant
Sure, IAD and PHL are my airport codes.
user
Can I know your travelling dates?
assistant
02/13 and 02/15 are my travelling dates.
user
Ok, do you have any other requirements?
assistant
I need  a connecting flight.
user
Ok, wait for a minute.
assistant
Ok.
user
Sorry to say that, there are no flight's available based on your travelling dates.
assistant
No issue. Thank you.
user
Thank you for reaching us.
assistant