You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Could you book my ticket in a connecting flight?

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are July 19 and July 21.

ASSISTANT: May I know your airport codes that you wish to board and land?

USER: I want to travel from ATL to ORD.

ASSISTANT: Do you have any class preferences?

USER: I prefer economy class.

ASSISTANT: May I know your name please?

USER: Sandra Green here.

ASSISTANT: We found a flight in an airline Delta with 1004 number having a single connection price of 200 in an economy class. Shall I reserve it?

USER: Please book my ticket.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.