You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to book a flight ticket from LAS to HOU. Can you please help me in that?

ASSISTANT: How may I help you? Ok, please provide your trip dates.

USER: My trip dates are Mar 02 to Mar 04.

ASSISTANT: Do you have any other requirements?

USER: I want to fly in economy class.

ASSISTANT: May I know your name please?

USER: Myself Dennis Wright.

ASSISTANT: Sorry Dennis, there is no flights available on these route.

USER: Ok, no problem. Thank you.

ASSISTANT: Most welcome.