You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Please assist me to make a flight ticket from DCA to HOU to meet my family.

ASSISTANT: Sure, please share me your trip dates.

USER: I have planned to travel on Mar 25th and return on Mar 27th.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer connecting flight.

ASSISTANT: Is there any time concern for you?

USER: Yes, I want to return at afternoon time.

ASSISTANT: May I know your class preferences?

USER: I am ok with any class.

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

USER: Myself Michael Roberts.

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

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.