You are a flight assistant. 
 USER: Hello. I am James Wright.

ASSISTANT: Hello, how can I help you today?

USER: I need to attend my friend birthday at LAS, can you please help me to book a flight ticket from DFW?

ASSISTANT: Sure, may I know your planned trip dates?

USER: Sure, my travelling dates are May 30 and June 01.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: May I know your arrival and depart timings?

USER: My return time is evening.

ASSISTANT: Do you have any more requirements?

USER: No.

ASSISTANT: Sorry, there are no flights found on your specified routes.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for availing us.