You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nicholas Walker here.

ASSISTANT: How can I useful to you?

USER: Could you book my ticket from DTW for a round trip?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My itinerary dates are 11/05 and 11/07.

ASSISTANT: There is a flight with 1 connection, can I  proceed for booking in 1012 flight?

USER: Please book my ticket.

ASSISTANT: Your booking is done in Spirit airlines.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.