You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Charles Adams. I would like to book a flight ticket from EWR to IAD. Could you please help me out?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 07/31 and return back on 08/02.

ASSISTANT: I found a flight 1022 of Delta airlines matches with your preferences, can I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket is booked. Thank you, have a good day.

USER: Thank you.