You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Christopher Carter here. I would like to book a ticket from DFW to SEA, can you please help me out?

ASSISTANT: Sure, let me know your travelling dates?

USER: I am travelling on these dates June 8th and 10th.

ASSISTANT: May I know your connection limit?

USER: I need a single connected flight.

ASSISTANT: Is there any class preference?

USER: I prefer business class.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no flight found on your desired journey routes.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for availing us.