You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to book a flight ticket from LGA to DTW?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are Feb 21 to Feb 23.

ASSISTANT: Do you have any specifications?

USER: I need a single connection of flight.

ASSISTANT: May I know your name please?

USER: Shirley Mitchell.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.