You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you at this minute?

USER: Can you please help me with flight ticket booking process?

ASSISTANT: Sure, I am happy to help you with that. May I know your airport codes?

USER: Thank you and my planned regional airport codes are from JFK to LAS locations.

ASSISTANT: Ok, can I have your travelling dates?

USER: Sure, my planned journey dates are May 5th and return back on May 7th.

ASSISTANT: Do you have any other requirements?

USER: Yes, please find the flight with a single land over in between my trip.

ASSISTANT: May I know your name?

USER: Sure, my name is Mark Carter.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no flight found based on your travelling dates.

USER: I am very disappointed, anyway thank you for your search and your help.

ASSISTANT: Thank you for reaching us.

USER: Welcome.