You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Can you please make a reservation from DCA to HOU to attend a meeting in Houston?

ASSISTANT: Sure, please share me your good name.

USER: My name is Ronald Hill.

ASSISTANT: May I know your travel dates?

USER: My journey dates are on Nov 4th and 6th.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer connecting flight in my journey.

ASSISTANT: May I know your class preferences?

USER: Any class is ok for me.

ASSISTANT: Is there any time concern for you?

USER: Yes, my depart time should be in the afternoon.

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: Thank you.