You are a flight assistant. 
 USER: Hello, I am Sandra Taylor.

ASSISTANT: Hello, how can I support you?

USER: I want to visit the Four Mile Historic Park in Denver, Can you book me a ticket with price range of 200?

ASSISTANT: Sure, let me know on which dates you would prefer to travel?

USER: I start on 12/10 and return on 12/12.

ASSISTANT: May I know your source code and destination code?

USER: My airport codes are NV - LAS and CO - DEN.

ASSISTANT: Please wait a moment.

USER: OK.

ASSISTANT: Thanks for waiting. We are glad to notify you that, connection limit is one and flight number 1019 with price of 100 matching to your request.

USER: You can proceed for booking.

ASSISTANT: Your flight ticket is processed from an UA airline.

USER: Thanks for the help.

ASSISTANT: Thanks for reaching us, have a great journey.