You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me in booking a flight ticket from JFK to SFO.

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: I will start on Dec, 12 and return on Dec, 14.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes, I need a stopover.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: I need to return at evening time.

ASSISTANT: May I know your name please?

USER: Paul Rodriguez here.

ASSISTANT: Ok, please wait a minute I will get back to you with the flight details.

USER: Sure.

ASSISTANT: Thank you for being patient, we didn't find any flights which matches your requirement.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for opting us, have a nice day.