You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am planning to attend a Sports Live Event in SFO, so please help me in booking a flight ticket from DTW.

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I would like to fly on July 21 and return on July 23.

ASSISTANT: Ok, do have any specifications?

USER: I need a single connection.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you. May I know your name please?

USER: Ok. Myself Robert Lopez.

ASSISTANT: Sorry Robert Lopez, there are no flights available on your requested dates.

USER: Not an issue. Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.