You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I need you to book a flight ticket from DCA to IAD. Please help me with it.

ASSISTANT: Sure, May I know the journey dates?

USER: December 10 and 12 are the respective journey dates.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a break in my journey.

ASSISTANT: Do you have any time preference?

USER: I am flexible to fly at any time.

ASSISTANT: Do you have any other requirements?

USER: Nothing much to specify.

ASSISTANT: May I know your name?

USER: My name is Margaret Scott.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok. Thanks for your time.

ASSISTANT: Thank you for opting us.