You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Stephen Evans. I would like to book a flight ticket from ORD to PHL.

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 05/24 and return back on 05/26.

ASSISTANT: I found a flight 1019 of Delta airlines matches with your preferences, can I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you, have a good day.