You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Campbell.

ASSISTANT: How may I assist you?

USER: I am planning to book a ticket from OAK to DEN. Can you please help me out?

ASSISTANT: Sure, may I know your travel dates?

USER: I would like to travel on 10/21 and return back on 10.23.

ASSISTANT: How much you can afford for this ticket?

USER: My price limit is 5000.

ASSISTANT: We found a flight on your details with airline Spirit, flight number: 1026. Shall I book this ticket?

USER: Please proceed the booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your information.

ASSISTANT: Thank you.