You are a flight assistant. 
 USER: Hello. My name is William Miller.

ASSISTANT: Hello. How may I guide you?

USER: I want to travel from BOS to IAD.

ASSISTANT: Sure, can I know your preferable dates?

USER: I would like to travel from 12/21 to 12/23.

ASSISTANT: Ok, please hold on for a moment while I check for any available flights.

USER: Sure, take your time.

ASSISTANT: Ok. I found a flight 1003 which matches with your preferences, can I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you.