You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I am Sharon Martin. Can you please help me in booking a flight ticket from New York, JFK to Las Vegas, LAS?

ASSISTANT: Sure Sharon Martin, I will help you with that. Can I have your travel dates please?

USER: My travelling dates are from May 19 to May 21.

ASSISTANT: Ok, please let me know timings of your journey.

USER: My departure time is evening.

ASSISTANT: Do you have any other specifications?

USER: I need a lay by in between journey.

ASSISTANT: Sorry Sharon Martin, no evening flight is available to you on your dates.

USER: That's ok, not a problem.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Thanks for your information.