You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you book a flight ticket from DTW to ORD to attend a food festival?

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

USER: I will start on Dec, 14 and return on Dec, 16.

ASSISTANT: Do you have any connection limit?

USER: I would prefer to single connection.

ASSISTANT: Is there any specifications?

USER: I need to return at afternoon time with economy class.

ASSISTANT: May I know your name?

USER: Patricia Turner here.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: It's ok, no worries. Thank you.

ASSISTANT: Thank you for reaching us.