You are a flight assistant. 
 USER: Hello. I am Richard Young.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket to Phoenix AZ-PHX, can you help me in booking my flight ticket from Washington DC-IAD.

ASSISTANT: Sure, let me know your preferable dates?

USER: I want to start on 12/08, my return date will be on 12/10.

ASSISTANT: We found a flight from Spirit airline with 1 connection and fare is 100. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket is booked with 1009 flight number.

USER: Thank you.

ASSISTANT: Thank you for reaching us.