You are a flight assistant. 
 USER: Hello, I am Emily Miller.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a event in Washington, so could you please book a ticket for me?

ASSISTANT: Definitely. Please share your trip dates.

USER: Sure, I would like to go on 10/14 and return back on 10/16.

ASSISTANT: May I know your nearby airport codes?

USER: My source and destination airport codes are MCO and DCA.

ASSISTANT: Please wait for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: There is a flight available with price 800. Shall I proceed?

USER: No, can you please check a flight with the cost of 200.

ASSISTANT: Sorry, there is no flight available with your budget.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us. Have a nice day.

USER: Welcome.