You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Frank Lopez here.

ASSISTANT: How can I help at this moment?

USER: I would like to book a flight ticket to Denver for a business meeting, can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, I will help you in booking flight ticket.

USER: Thank you.

ASSISTANT:  Can you please mention your travel dates for booking flight ticket?

USER: Sure, I am planning to move on 01/31 and please book my return ticket on 02/02.

ASSISTANT: May I know your preferable airport code names?

USER: Sure, my nearest genesis airport code is JFK and my destination code is DEN.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a flight with no stop overs, please check for it.

ASSISTANT: Sure, Please hold on a moment, I will check flight availability in this route.

USER: Ok, take your time.

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

USER: Oh! So sad to hear that. Anyway, thank you for the information.

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