You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Please book a ticket from Denver, CO-DEN to Washington DC-IAD.

ASSISTANT: Sure, may I know your preferable dates to travel?

USER: Departure is by 01/20 and 01/22 is return date.

ASSISTANT: On whose name you need me to book the ticket?

USER: I am Timothy Martinez.

ASSISTANT: Do you prefer a connecting flight or a direct flight?

USER: I prefer connecting flight.

ASSISTANT: Ok, please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting, we have a connecting flight in your route at a price of 100 in Spirit airline. Shall I proceed with the booking in flight 1006?

USER: Please book a flight.

ASSISTANT: Your booking has been done in economy class.

USER: Thanks.

ASSISTANT: Thank you for picking us.