Hello.
user
Hello. How can I help you?
assistant
My self  Donald Thompson. My travelling dates are 03/17 to 03/18.
user
Ok.
assistant
Actually, I am planning to travel from IAD to IAH. Can you help me that.
user
Sure, but there is no flight found on your requested dates.
assistant
That's sad to hear. Thank you for your service.
user
Welcome.
assistant