You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am David Green.

ASSISTANT: How can I provide assistance to you?

USER: Can you please help me in booking my flight ticket from Las Vegas NV-LAS to MI-DTW?

ASSISTANT: Sure, can I know your travel dates?

USER: 10/29 to 10/31 are my travelling dates.

ASSISTANT: Is there any restriction on fare?

USER: I can spend up to 500.

ASSISTANT: Thanks for your details, we found a connecting flight from Spirit airline with price 200. Shall I proceed to book?

USER: Please move with the booking.

ASSISTANT: Your ticket has been processed with 1008 flight number.

USER: Thank you.

ASSISTANT: Thanks for opting us.