You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I'm planning to visit Phoenix, can you please book the ticket from DEN to PHX?

ASSISTANT: Sure, let me know your travelling dates.

USER: Sure, my planned departure and return travel dates are 22nd and 24th of April.

ASSISTANT: May I know your connection limit?

USER: I prefer single connected flight to travel.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Catherine Martin.

ASSISTANT: We found a Spirit airline, flight number: 1003, price: 200, it is a direct flight. Shall I proceed to booking?

USER: That's fine, you can proceed for booking the ticket.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you so much for your help.

ASSISTANT: Thank you, have a good day.