You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. In which way I can aid you today?

USER: I need to book a flight ticket from JFK, Can you please help me for booking?

ASSISTANT: Sure, I will aid you with that. Can you please mention your preferable travel dates?

USER: I would like to travel on 09/16 to return on 09/18.

ASSISTANT: Could you please mention your preferable destination airport code name?

USER: My destination airport code is LAS.

ASSISTANT: May I know your name for further process?

USER: Emma Smith here.

ASSISTANT: Do you need any specific depart and arrival time for this trip?

USER: No.

ASSISTANT: Do you have any another specifications?

USER: I need a business class with normal cost airline.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.