You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you aid me in booking a flight ticket from ORD to PHL?

ASSISTANT: When you are willing to travel?

USER: I would like to go on Oct 28th and return back on Oct 30th.

ASSISTANT: Do you have any class preference?

USER: Ensure it is in the business class.

ASSISTANT: May, I know your good name?

USER: Myself Mark Gonzalez.

ASSISTANT: Do you have any connection limit?

USER: Ensure it is a single connecting flight.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: That's ok, thank you for checking the availability.

ASSISTANT: Thank you for reaching us.

USER: Welcome.