You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am looking for a flight from Washington, IAD to Washington, DCA. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, we are pleased to serve you. In which month, you have planned your journey?

USER: My planned travel dates are from Mar 07 to Mar 09.

ASSISTANT: Is there any airline preference for you?

USER: No.

ASSISTANT: May I know your depart and arrival time?

USER: I am comfortable with any flight timings.

ASSISTANT: Do you have any other requirements?

USER: No, I din't have any other requirements.

ASSISTANT: May I know your good name please?

USER: Sure, myself John Harris.

ASSISTANT: We found a flight with couple of connections in United Airlines. Shall I proceed?

USER: Please make sure that, I need a single connecting flight in my journey.

ASSISTANT: Sorry to say, there are no flights available with your required connection.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER:  Thank you for the information.