Hello, I am Steven King.
Hello. How can I serve you?
I need to attend a meeting in Space center at Houston, can you please help me with booking?
Sure, I can help you. Can I know your travelling dates?
 I want to travel on 04/28 and return on 04/30.
Do you have any connection limit?
I need a connecting flight.
May I know your airport codes?
My source is at Washington, DC-DCA and destination is at Houston, TX-IAH.
Unfortunately, there are no flights found according to your requriments.
Ok, not an issue. Thank you for your help.
Thank  you for consulting us.