You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patricia Collins here.

ASSISTANT: How may I help you out?

USER: Can you please reserve me a flight from DTW to reach DEN?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Sure, my travel dates are Apr 26th and 28th.

ASSISTANT: Do you have any specifications?

USER: My depart time must be in the afternoon. I need a single connecting flight.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.