You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Steven Scott here. I want to attend a Seminar in Las Vegas. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, can you please let me know your journey dates?

USER: My travelling dates are Jan 17 and Jan 19.

ASSISTANT: Kindly assign your origin airport code?

USER: My airport codes are DFW and LAS.

ASSISTANT: Do you prefer any connection in between journey?

USER: Yes, I prefer single connection limit.

ASSISTANT: Please mention your class limit.

USER: I want to prefer business class.

ASSISTANT: Is there any more specifications?

USER: I want to departure on afternoon and return on evening.

ASSISTANT: Ok, please be on hold.

USER: Ok, I will wait.

ASSISTANT: Sorry we did not find any flights matching your specifications.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.