You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: My name is Ashley Carter. I want to book a flight ticket with price limit of 200.

ASSISTANT: Sure, may I know your source and destination?

USER: My source and destinations are CO-DEN, GA-ATL.

ASSISTANT: May I know your travelling dates?

USER: I will start on 11/20, return on 11/22.

ASSISTANT: We found an airline: Delta, flight number: 1015 with a single connection and price is 100. Shall I proceed to booking?

USER: Yes, please.

ASSISTANT: Your booking is done.

USER: Thank you.

ASSISTANT: Thank you, for choosing us.