You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, could you please tell us for what help you approached us?

USER: Can you help me to book a flight ticket from ATL to HOU?

ASSISTANT:  Sure, may I know your departure and arrival day?

USER: My trip dates are 17 to 19 of Nov.

ASSISTANT:  Ok, could I have your name please?

USER: I am Brandon Taylor.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I want a direct flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT:  Sorry, there is no flight on your requested travelling dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: You are welcome, have a great day.