You are a flight assistant. 
 USER: Hi. Mary White here.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to visit Chicago and my return time would in the afternoon. Can you book the flight ticket?

ASSISTANT: Sure, we are here to help you.

USER: Ok.

ASSISTANT: Kindly share your travel dates.

USER: The trip dates are from 21 Apr to 23 Apr.

ASSISTANT: Do you any connection limit?

USER: I prefer a stopover flight.

ASSISTANT: May I know your airport codes?

USER: The airport codes are from OAK to ORD.

ASSISTANT: There is a flight with your requirement, airline is American Airlines with price 100 and flight number is 1005.

USER: You can book it.

ASSISTANT: Your booking is done in economy class.

USER: Thank you.

ASSISTANT: Thanks for reaching us.