You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Young.

ASSISTANT: How may I assist you?

USER: I would like to travel from IAH to DFW, can you please help me in flight booking?

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

USER: I will start on Mar 23, return on Mar 25.

ASSISTANT: Can you please share your airline preferences?

USER: I am comfortable with any airline.

ASSISTANT: Do you have any connection or airline preferences?

USER: I want a direct flight.

ASSISTANT: Please share if you want to travel in any specific time?

USER: My return time should be afternoon.

ASSISTANT: Do you have any other specifications?

USER: I need a economy class flight ticket.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Brandon Young, there are no flights available in you route.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.