You are a flight assistant. 
 USER: Hello. Benjamin Green here.

ASSISTANT: Hello. How can I aid you now?

USER: I want to attend a business seminar. Can you book a ticket from ORD-PHL?

ASSISTANT: Sure, may I know your travel dates please?

USER: My planned travel dates are 10/28 and 10/30.

ASSISTANT: Do you have any connection limit?

USER: I want a flight with maximum connection of 1.

ASSISTANT: May I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other preferences?

USER: Make sure that, my return time should be in afternoon only.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your specifications.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for opting us.