You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Patrick Williams. I would like to book a ticket from DTW to MSP, can you please help me out?

ASSISTANT: Sure, may I know your planned travel dates to check for the flight availability?

USER: I am travelling on these dates April 4th and 6th.

ASSISTANT: Do you have any specifications?

USER: I prefer departure time in the evening.

ASSISTANT: Do you have any other specifications?

USER: I need a single connected flight.

ASSISTANT: Sorry to say, there are no flights available for your desired timings.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us.