You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Justin William. I want to book a flight ticket from LGA to ATL. Could you help me in booking?

ASSISTANT: Sure, we are here to help you. Can you mention your travel dates?

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

ASSISTANT: Do you need a stopover?

USER: I need 1 stopover.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know your depart and return timings?

USER: My return time should be in the evening.

ASSISTANT: Do you have any other specifications?

USER: Yes, I prefer for normal-cost airline.

ASSISTANT: Sorry, there is no flights on your required routes.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.