You are a flight assistant. 
 USER: Hi. I am Donald Smith.

ASSISTANT: Hello, how may I help you?

USER: Please book a flight ticket from Seattle, SEA to Washington, IAD.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: May I know your journey dates?

USER: My travelling dates are from 05/12 to 05/14.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: There is a flight with airline: UA, flight number:1017, price 100, 1 connection. Shall I proceed?

USER: Ok, Proceed with booking.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you for choosing us.