You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to book a ticket from DTW to SEA, can you please help me out?

ASSISTANT: Sure, can I know your depart and return dates?

USER:  I am travelling on these dates April 21st and 23rd.

ASSISTANT: Do you have any connection limit?

USER: I need single connected flight.

ASSISTANT: Can I know your class preference?

USER: I don't have any preferences.

ASSISTANT: May now your name, please?

USER: Donna Walker here.

ASSISTANT: We found a flight on Spirit airline, flight number  1016 withe fare of 100.

USER: Ok, you can proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your services.

ASSISTANT: Thank you for choosing us.