You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am David Lee. I need to book a ticket from NY-LGA to CO-DEN. Could you help me?

ASSISTANT: Sure, may I know your depart and arrival dates?

USER: My travelling dates are from 03/15 to 03/17.

ASSISTANT: Please wait a minute.

USER: OK.

ASSISTANT: There is a flight on AA airline, flight number as 1027 with the fare of 100.

USER: Yes, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you for helping me.

ASSISTANT: Thank you for availing us.