You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Michelle Taylor. I would like to book a flight ticket from IAD back to IAD.

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferable dates are from 06/11 to 06/13.

ASSISTANT: I found a flight 1008 of Southwest airlines matches with your preferences, can I proceed?

USER: Please proceed with the booking.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.