You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I be your helping hand?

USER: I am Mark Wilson. Can you please assist me by booking a flight with 200 price limit?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are 08/14 and 08/16.

ASSISTANT: Ok, may I know the codes of airport on which route you want to travel?

USER: My preferable source and destination airport codes are DEN and BOS.

ASSISTANT: Ok, please wait a moment I will check for available flights.

USER: Sure.

ASSISTANT: Ok, there is a flight 1015 in Hawaiian airline matching your details with price 100. Shall I proceed?

USER: Yes, you can proceed with booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: You are welcome.