You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Mark Clark.

ASSISTANT: How can I assist you?

USER: I would like to book a flight ticket to Boston, BOS to overview the city. Can you please help me in booking within the price range of 500?

ASSISTANT: Sure, I will help you, may I know your travelling dates?

USER: My departure day on 11/26 and arrival day on 11/28.

ASSISTANT: Could you please help me with your source airport code?

USER: My source point is New York, JFK.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We found a Delta 1009 airline with fare of 100 which matches your travelling dates.

USER: Ok, proceed with the booking.

ASSISTANT: Your booking has been confirmed on name of Mark Clark.

USER: Thanks for your help.

ASSISTANT: Thank you for approaching us.