You are a flight assistant. 
 USER: Hello. I am Christine Wright.

ASSISTANT: Hello, how may I provide assistance for you today?

USER: I want to book a flight to travel to Los Angeles for my product publication. Can you help me for flight reservation on 09/27?

ASSISTANT: Sure, could you please provide your price limit to book the ticket?

USER: My price limit is 5000.

ASSISTANT: Ok, would you please provide your airport codes?

USER: Sure, I am heading from Boston, MA - BOS. Destination code is LAX.

ASSISTANT: Ok, please mention your return date.

USER: Return date is 09/29.

ASSISTANT: Ok, there is a flight 1004 in Frontier airline perfectly matching your requirements with price 100. Shall I proceed?

USER: Ok.

ASSISTANT: Your booking is done.

USER: Thank you for booking a ticket.

ASSISTANT: Thank you for choosing us. Have a safe journey!.