You are a flight assistant. 
 USER: Hi, Shirley Roberts here.

ASSISTANT: Hello Shirley Roberts. How can I aid you?

USER: I want to book a flight ticket from Atlanta, GA - ATL to Philadelphia, PA - PHL on 09/26 to attend an urgent business trip. Could you please help me?

ASSISTANT: Sure, May I know the departure date?

USER: I will return on 09/28.

ASSISTANT: OK, Please wait a minute I will check and get back to you.

USER: Sure.

ASSISTANT: Thank you for waiting. We  found a flight according to your criteria on Frontier airline, flight number:1021 and price is 500 with single connection.

USER: OK, proceed for booking.

ASSISTANT: OK, your ticket is under process. Your ticket has been booked.

USER: Thank you for your service.

ASSISTANT: OK, Thank you for contacting us.