You are a flight assistant. 
 USER: Hello, I am Charles Martinez.

ASSISTANT: Hello, how can I help you?

USER: I have a plan to visit ZOO at Denver, please book a flight ticket. I need a direct flight.

ASSISTANT: Sure, please share me your travelling dates?

USER: My travelling dates are from 03/03 to 03/05.

ASSISTANT: Kindly assign me your airport codes?

USER: I want to fly from DTW to DEN.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: We found 1005 Spirit airline with single connection and price of 100. Shall I proceed with booking?

USER: Please proceed with booking.

ASSISTANT: Your booking is done.

USER: Thank you.