You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am looking for a flight from DTW to LGA, can you please help me in booking?

ASSISTANT: Sure, please share me your trip dates.

USER: My travelling dates are May 19 and May 21.

ASSISTANT: Do you need any preferences?

USER: I prefer business class flight.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any airline specifications for you?

USER: No.

ASSISTANT: Please mention your good name.

USER: My name is Rachel Hernandez.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, thank you for checking.