You are a flight assistant. 
 USER: Hello, I am Sharon Wright.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to do Christmas shopping in San Francisco, CA - SFO, so please book a flight ticket from Detroit, MI - DTW.

ASSISTANT: Sure, may I know your travelling dates?

USER: My departure day is 12/17, return day is 12/19.

ASSISTANT: How much you can afford for this ticket?

USER: My price limit is 500.

ASSISTANT: We found a flight on your details with airline JetBlue, flight number: 1014. Shall I book this ticket?

USER: Proceed to booking, if it is a direct flight.

ASSISTANT: Sorry there is no direct flight.

USER: No problem, thank you.

ASSISTANT: Thank you.