Hello.
user
Hello. How may I guide you today?
assistant
I want to do some changes in my existing reservation. Can you help  me for that?
user
Sure, I will help you with that.
assistant
Thank you.
user
May I know your name please?
assistant
My name is Dennis Williams.
user
I found a reservation for you, can you please share your preferable journey dates?
assistant
My travelling dates are Nov 21 and Nov 23.
user
Can you please share your source and destination airport codes?
assistant
My travelling airport codes IAD and SFO.
user
Do you have any connection limit?
assistant
I need a single connecting flight.
user
I am sorry to say that there is no reservation found under your name.
assistant
That's ok, thank you for checking.
user
Thank you for reaching us.
assistant
Welcome.
user