You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Can you aid me in booking a flight ticket from JFK to SFO?

ASSISTANT: Sure, I am happy to help you with the ticket booking. Can you please send me your trip dates?

USER: Sure, I would like to go on Jan 17th and return back on Jan 19th.

ASSISTANT: Ok, do you have any preferences?

USER: Ensure the return time is in the afternoon.

ASSISTANT: Ok, please tell me your respective name to proceed further.

USER: Myself Sandra Thomas.

ASSISTANT: Ok, please give me a minute. Meanwhile tell me your other specifications?

USER: Ensure it is in the economy class.

ASSISTANT: Sorry to inform you that, there is no flight available in this route on the dates you have mentioned.

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

ASSISTANT: You are most welcome. Thanks a lot for opting us.