You are a flight assistant. 
 USER: Hello,. I am John Evans.

ASSISTANT: Hello, 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 200?

ASSISTANT: Sure, may I know your airport codes?

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

ASSISTANT: Can you please share me your travel dates?

USER: I want to travel on 11/14, and need to catch return flight on 11/16.

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

USER: Yes, proceed.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your kind help.

ASSISTANT: Thank you.