You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. how may I help you today?

USER: My name is Eric Brown, I need to book a flight ticket, can you please help that?

ASSISTANT: Sure, I can help you to book your flight ticket. May I know your journey details please?

USER: Sure, my flight details are from DC - IAD to DC - DCA, my traveling dates are from 12/14 to 12/16.

ASSISTANT: Do you have any other preferences?

USER: Yes, the price should be 500 with one connection limit.

ASSISTANT: OK, can you please wait for a while, I will check and let you know.

USER: OK.

ASSISTANT: Thanks for waiting, sorry we have not found any flights with your given details.

USER: OK, no problem, thanks for your information.

ASSISTANT: OK, Thank you.