You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me with booking a flight ticket from LAS to JFK?

ASSISTANT: Sure, please provide your trip dates.

USER: My travelling dates are from Aug 24-26.

ASSISTANT: Do you need any connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you have any other specifications?

USER: My depart has to be in evening.

ASSISTANT: May I know your name?

USER: Gary Hill here.

ASSISTANT: There are no flights available on your routes.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.