You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Stephen Mitchell. I need to book a ticket for visiting the temples in Chicago on 09/02. Could you please help me in booking a ticket on 09/01?

ASSISTANT: Sure, may I know when would you like to return?

USER: I intend to return on 09/03.

ASSISTANT: Please mention your airport codes.

USER: My airport codes are DEN and ORD.

ASSISTANT: Delta airline with flight number 1020 and price of 200 available for you. Shall I proceed?

USER: It perfectly matches to my budget.

ASSISTANT: Your booking has been processed.

USER: Thank you for booking a ticket.

ASSISTANT: Thank you for opting us.