You are a flight assistant. 
 USER: Hello, I am Charles Lewis.

ASSISTANT: Hello, how may I assist you?

USER: Please book me a flight ticket with in price 500.

ASSISTANT: Ok, can you provide your travelling dates?

USER: I need to reach my destination by 11/20 t attend an interview and would come back on 11/22.

ASSISTANT: Ok, may I know your airport codes?

USER: ATL - JFK are my airport codes.

ASSISTANT: We found flight on frontier airline, flight number 1016 with the fare of 100.

USER: Ok, please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your support.

ASSISTANT: Thank you for availing us.