You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Larry Roberts. I want to visit Mount Evans at Denver, CO - DEN, will you help me in booking a ticket?

ASSISTANT: Sure, may I know where are you heading from?

USER: Sure, I am boarding from Phoenix, AZ - PHX.

ASSISTANT: Is there any price limit?

USER: Yes, price should not exceed 200.

ASSISTANT: Could you please provide me your travel dates?

USER: Sure, my departure date is on 08/10 and arrival date is 08/12.

ASSISTANT: We found an Hawaiian airline with flight number 1001 available on your requested dates and price is 200. Shall I proceed.

USER: Ok, proceed.

ASSISTANT: Your booking has been processed.

USER: Thank you for your service.

ASSISTANT: Thank you for opting us.