You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Please help me to book a flight ticket from IAD to LAX.

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from May, 11 to May, 13.

ASSISTANT: Do you need any connection limit?

USER: I need a single connecting flight.

ASSISTANT: May I know your name please?

USER: I am Mary Harris.

ASSISTANT: Do you have any other specifications?

USER: I prefer an economy class to fly.

ASSISTANT: We found a flight with an airline Frontier of flight 1002 in an economy class. Can I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for booking.

ASSISTANT: Thank you for availing us.