You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Jason Wright. I want to travel from HOU to DFW. Can you book a direct flight for me?

ASSISTANT: Sure, can I know your preferable dates?

USER: I want to travel in the flight on 10/10 and 10/12.

ASSISTANT: I am sorry, there are no flights available.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you, have a good day.