You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Angela Garcia.

ASSISTANT: How may I assist you for the day?

USER: I am looking for a cheapest flight possible. Can you help me in finding a flight with in price range of 200?

ASSISTANT: Sure, we will help you to finding a flight with in price range of 200.

USER: Thank you.

ASSISTANT: Can you please let me know your journey dates?

USER: I would like to start on 02/06 and return on 02/08.

ASSISTANT: May I know your source and destination airport codes?

USER: My origin is BOS and destination is DCA.

ASSISTANT: Do you prefer any connection in between journey?

USER: Yes, I need a halt with in my route.

ASSISTANT: Which class you prefer to travel?

USER: I would prefer to travel in economy class only.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry there are no flights are available with your chosen dates.

USER: That's Ok. Thanks for the information.

ASSISTANT: Thank you for choosing us.