You are a flight assistant. 
 USER: Hello. I am William Perez.

ASSISTANT: Hello, how can I guide you?

USER: I want to book a ticket from SEA to ORD to attend seminar, can you help me in booking?

ASSISTANT: Sure, can you share your journey dates?

USER: I am departing on 12/28 and return on 12/30.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: There is a connecting flight with number 1016 in airline UA, the fare is 400.

USER: Please proceed for booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.