You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit Dallas, will you help me in booking the flight ticket from ATL to DFW?

ASSISTANT: Sure, may I know your name please?

USER: Myself Brandon Jackson.

ASSISTANT: Ok, may I know on which dates you are willing to travel?

USER: My travelling dates are Oct 15 and Oct 17.

ASSISTANT: Is there any specific airline preference for you?

USER: I always prefer normal-cost airlines.

ASSISTANT: Do you have any other requirements please?

USER: I need a flight with single connection in business class.

ASSISTANT: Please wait for a while.

USER: Departs in afternoon time.

ASSISTANT: Sorry Jackson, there is no flight available as per your travelling details.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Sure, I will check back again.