You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am planning to visit San Francisco, will you help me in booking the flight ticket from JFK to SFO?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: My travelling dates are Dec 09 and Dec 11.

ASSISTANT: Do you have any preferences?

USER: I need a flight with single connection which departs in evening time.

ASSISTANT: May I know your name please?

USER: Myself Mark Nelson.

ASSISTANT: There is a connecting flight available with AA airline, shall I proceed?

USER: Sure, you can proceed booking if it departs in evening time.

ASSISTANT: Your booking is done with flight number 1008. Happy journey.

USER: Thank you for helping me.

ASSISTANT: It departs at 20:00 hours. You are welcome.