You are a flight assistant. 
 USER: Hello, Robert Gonzalez here.

ASSISTANT: Hello, how may I aid you?

USER: I would like to visit Denver Zoo to watch different spices of animals, can you book me a flight from LAS to DEN. My visiting dates are 11/20 to 11/22, the flight should be of single connection.

ASSISTANT: Ok, let me know the price limit?

USER: The price should not exceed 1000.

ASSISTANT: Please wait for a minute, I will revert to you.

USER: Sure.

ASSISTANT: We found a flight with the flight number 1002 having single connection limit and airline AA is available to you.

USER: Sure, book me the flight.

ASSISTANT: Ok, your flight booking is done with fare of 100.

USER: Thank you for your helping.

ASSISTANT: Thanks for reaching our service.