Hi.
user
Hello, how can I assist you?
assistant
Virginia Harris here. I want to do some changes in my flight ticket reservation. Can you help me do that?
user
Sure, I am happy to help you. Please wait, I will check your reservation status and get back to you.
assistant
Ok.
user
Harris, I have found your reservation. Please provide me your travel dates.
assistant
My preferable dates for travel are 09/07 to 09/09.
user
Ok, please help me with your source and  destination airport codes.
assistant
My airport codes for boarding the flight are IAD to DFW.
user
Sorry, there is no flight available on your preferred dates.
assistant
Ok, not a problem. Thank you.
user
You are most welcome and thank you for choosing us.
assistant