You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking my ticket from JFK to LAS?

ASSISTANT: Sure, may I know your trip dates? Ok, do you have any other requirements?

USER: Sure, my trip dates are from 05/21 to 05/23. Yes, I need a single connecting flight.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: May I know your name please?

USER: Myself Frank Phillips.

ASSISTANT: Sorry, there is no flight available as per your request.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.