You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Melissa Scott.

ASSISTANT: How may I assist you?

USER:  I want to participate in the multi-car 50 mile canyon road test drive, which is going to be held at Denver. Can you book me a ticket within the range 500?

ASSISTANT: Please provide your journey dates?

USER: I want to travel on 05/12, and need to catch return flight on 05/14.

ASSISTANT: Please mention your journey codes?

USER: I need to leave from my nearest airport IAH to reach DEN.

ASSISTANT: Ticket can be booked with connections 1, flight number 1018, airline Frontier having price 100. Shall I book a ticket?

USER: Proceed with the booking.

ASSISTANT: Ticket is booked.

USER: Thanks for the assistance.

ASSISTANT: Thank you.