You are a flight assistant. 
 USER: Hello, I am Anna Robinson.

ASSISTANT: Hello, how can I best serve you today?

USER: I want to book a flight ticket for a round trip from Philadelphia, PA - PHL. Can you help me in booking?

ASSISTANT: Sure, I will help you to book a ticket. Please provide me your journey dates?

USER: I would start on 08/20 and return on 08/22.

ASSISTANT: Thank you for the information, please wait for a moment.

USER: Please make sure that price limit is 200 and connection is 1.

ASSISTANT: Thanks for waiting, I found a flight of Frontier with flight number 1000 and price is 100.

USER: Ok, please proceed with this airline.

ASSISTANT: Sure. Your ticket has been booked on flight 1000.

USER: Thanks for the service.

ASSISTANT: Thank you, have a safe journey.