You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Michael Evans. One of my friend invited me to attend two day workshop in ORD, can you find any flight from ORD?

ASSISTANT: Sure, on which dates are you planning to travel?

USER: My preferable travelling dates are from 12/24 to 12/26. I need my ticket fare should be within 500.

ASSISTANT: Flight-1006 of Spirit airline have vacancies, shall I reserve a seat for you?

USER: Yes, please book my ticket.

ASSISTANT: Your seat is reserved, have a safe journey.

USER: Thank you.

ASSISTANT: Thank you for choosing our service.