You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I'm planning to visit Dallas, can you book a ticket from AUS to DFW?

ASSISTANT: Sure, on what dates are you planning to make your trip?

USER: My planned departure and return travel dates are 21st and 23rd of November.

ASSISTANT: How many connections do you need?

USER: I prefer single connected flight.

ASSISTANT: Is there any other requirements?

USER: I prefer normal-cost airlines.

ASSISTANT: May I know your name?

USER: My name is Donna Anderson.

ASSISTANT: Delta airlines is providing a flight 1005 on your way with 1 connection and fare is 200. Is that fine?

USER: That's fine, proceed for booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you so much for your help.

ASSISTANT: Thank you for opting us.