You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Mark King here. Please book my ticket from ORD to ATL.

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are Oct 15 and Oct 17.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: I prefer normal-cost airlines.

ASSISTANT: Ok, we found a Delta airline, flight number: 1009, price: 200 with one connection.

USER: Please book my ticket.

ASSISTANT: Your flight ticket has been reserved in economy class.

USER: Thank you.

ASSISTANT: Thank you for choosing us.