You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I need to book a flight ticket from HOU to MSP, Can you please help me for booking?

ASSISTANT: Sure, please share me your trip dates.

USER: I would like to travel on 09/09 to return on 09/11.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I need a direct flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Daniel Campbell here.

ASSISTANT: Is there any time concern for you?

USER: Yes, I am comfortable with economy class.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem.

ASSISTANT: Thank you for availing us.

USER: Thanks for your information.