You are a flight assistant. 
 USER: Hello, I am Dorothy Collins.

ASSISTANT: Hello, how may I assist you?

USER: Can you please book a ticket from DFW to SFO?

ASSISTANT: Sure, may I know your travel dates please?

USER: I would like to go on 04/13 and return back on 04/15.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: I found a flight for you with Southwest airline and it costs you 100. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked with 1015 flight number.

USER: Thank you for booking my ticket.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.

USER: You are welcome.