Hello, I am Edward Evans.
user
Hello, how can I best assist you now?
assistant
I want to make a round trip to Houston, IAH. Could you help me with booking  a flight ticket?
user
Do you have any price limit?
assistant
Make sure the price limit is under 200.
user
When do you plan your trip?
assistant
My travel dates are 12/22 to 12/24.
user
What is your source airport?
assistant
Source airport code is HOU.
user
Ok, please wait a moment.
assistant
Sure.
user
Sorry to inform you that there is no flight found on your dates.
assistant
Thanks for the information.
user
Thanks for contacting us, wish you a good day.
assistant