You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I am Andrew White. I want to book a ticket from DTW to ORD, can you please make a reservation?

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

USER: My travelling dates are on Dec 29 and Dec 31.

ASSISTANT: Please share me your connection limit.

USER: I need one connection.

ASSISTANT: Do you have any specifications?

USER: I need to depart at morning.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.