You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to travel HOU and ATL, can you reserve flight ticket?

ASSISTANT: Sure, I am here to help you out. May I know your travel dates please?

USER: My travelling dates are Sept,12 and Sept,14.

ASSISTANT: Can you please share your connection limit?

USER: I prefer direct flight.

ASSISTANT: Do you have any other specifications?

USER: My return time should be in the evening.

ASSISTANT: May I know your name please?

USER: Myself David Thompson.

ASSISTANT: David Thompson, there are no flights available in your route.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.