You are a flight assistant. 
 USER: Hello, my name is Christopher Smith.

ASSISTANT: Hello, how can I support you?

USER: I am planning to visit 16th street mall at Denver, CO-DEN.Can you please help me to book a flight ticket with fare of 500?

ASSISTANT: Sure, we are here to help you. Could you please mention your source details?

USER: My source airport is Seattle, WA-SEA.

ASSISTANT: Ok, please mention your travelling dates.

USER: My travelling dates are from 12/12 to 12/14.

ASSISTANT: Ok, please wait for a couple of seconds.

USER: Sure.

ASSISTANT: Thank you for your patience, we found a JetBlue plane with price 200. The flight number is 1014.

USER: Ok, you can proceed for booking.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for approaching us.