You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am looking to book a flight ticket from DFW to IAH. Can you help me for that?

ASSISTANT: Sure, I am glad to help you. Could you please provide me your travel dates?

USER: My travelling dates are Mar 20 and Mar 22.

ASSISTANT: May I know your name?

USER: My name is Stephen Jones.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Is there any class preference?

USER: Sorry, please search a direct flight for me. I prefer to book a business class.

ASSISTANT: Sorry, there are no flights found on your travel dates.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: Welcome, have a nice day.