Hello.
user
Hello, how can I help you today?
assistant
Can you please change my existing reservation due to postpone of my trip?
user
Sure, can I have your name please?
assistant
My name is William Baker.
user
We found a reservation on your name, can  you please share your new trip dates?
assistant
My new trip dates are June 20 and June 22.
user
Let me know your airport codes?
assistant
I am heading to SFO from ORD.
user
Any other requirements to be met?
assistant
I need a single connecting flight.
user
Sorry, no flights found with your given details.
assistant
Not a problem, thank you for the information.
user
Thank you for reaching us.
assistant