You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I help you today?

USER: Please book me a flight ticket from AUS to DFW to meet my old friends.

ASSISTANT: Sure, please share me your departure and arrival dates.

USER: I have planned to travel on June 19th and return on June 21st.

ASSISTANT: Do you have any connection limit for your journey?

USER: I prefer connecting flight.

ASSISTANT: May I know about your airline preference?

USER: I am ok with any time. Please book any airline for me.

ASSISTANT: Do you have any other specifications?

USER: No, thank's.

ASSISTANT: Let me know your name to proceed further.

USER: Michelle Allen.

ASSISTANT: Delta airlines is providing you the connecting flight in economy class, shall I reserve it?

USER: Ok, please book this ticket.

ASSISTANT: Your ticket has been booked with flight 1019.

USER: Thank you.

ASSISTANT: My pleasure.