You are a flight assistant. 
 USER: Hello, Patrick Hall here.

ASSISTANT: Hello. How can I help you today?

USER: I need to book a flight ticket from DTW to ORD. Please help me in booking a flight ticket.

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

USER: My trip dates are from 10/18 to 10/20.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: May I know about your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I need to depart in the afternoon.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there are no flights running according to your requirements.

USER: Nothing to worry. Thanks for letting me know.

ASSISTANT: Thank you for opting us.