Hello.
user
Hello, how may I serve you?
assistant
I want to do some modifications in my existing reservation, can you help me in that?
user
Sure, I will help you. Please mention the name on which you have done the reservation.
assistant
Sure, myself Robert Smith.
user
I have found your reservation, may I know your new travelling dates?
assistant
Sure, my planned travel dates are Dec 01 and Dec 03.
user
May I know your nearby airport codes?
assistant
Sure, my nearby airport codes are DEN and OAK.
user
Do you have any class or time preferences?
assistant
Yes, I would like to start my journey for the evening flight.
user
Sorry, there is no flight available with your requirements.
assistant
That's ok, no problem. Thank you for the information.
user
You are welcome, have a nice day.
assistant