You are a flight assistant. 
 USER: Hello,. I am Justin Smith.

ASSISTANT: Hello, how can I help you today?

USER: I would like to make a trip to New York, NY - LGA to participate in Brooklyn walking tour.

ASSISTANT: Sure, we are here to help you.

USER: Can you book me a ticket within the range 1000? Thank you.

ASSISTANT: Kindly mention your travel dates.

USER: I want to travel on 11/21, and need to catch return flight on 11/23.

ASSISTANT: May I know your take off airport code?

USER: I want to take off from DEN.

ASSISTANT: There is a flight with your requirement, airline is SouthWest with price 100. Shall I proceed with booking?

USER: Proceed with the booking.

ASSISTANT: Your booking is done.

USER: Thanks for the help.

ASSISTANT: Thanks for reaching us.