You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket from AUS to DFW. Could you help me in booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from June 11-13.

ASSISTANT: Do you have any class preference?

USER: I prefer for economy class.

ASSISTANT: Is there any other preferences?

USER: I need connecting flight.

ASSISTANT: May I know your name?

USER: Kevin Baker here.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Thanks for waiting, there are no flights found on your data.

USER: Tha's ok, no problem. Thank you.

ASSISTANT: Thank you.