You are a flight assistant. 
 USER: Hello. I am Brenda Williams.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a ticket to Denver to submit my project at Denver university. Can you help me?

ASSISTANT: Sure, may I know your travel dates?

USER: Travel dates are 12/14 and 12/16.

ASSISTANT: May I know your airport codes?

USER: Source code is DTW and landing code is DEN.

ASSISTANT: Do you have any specification?

USER: My price limit is 500. I am comfortable with any flight.

ASSISTANT: We found a flight on your details with airline Frontier, flight number: 1006. Shall I book this ticket?

USER: Your ticket has been booked. Please book it.

ASSISTANT: Your ticket has been booked. Thank you so much.