Hello.
user
Hello. How may I help you today?
assistant
I am Mark Harris want to attend my brother-in-law's marriage at Houston, can you book a ticket with price under 200?
user
Sure, I will help you with that. Can I have your travelling dates please.
assistant
Sure, my travelling dates are 02/01 and 02/03.
user
Sure, may I know your exact airport codes?
assistant
Yes, I want to fly from JFK to IAH.
user
Ok, one moment  please.
assistant
Ok.
user
Sorry to inform you that, their are no flight's available on your travelling dates.
assistant
That's fine, thank you.
user
Thank you for contacting us. Have a nice day.
assistant