You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Please help me in booking flight ticket from LGA to JFK to attend an event.

ASSISTANT: Sure, when are you willing to travel?

USER: My trip dates are May 16 to May 18.

ASSISTANT: May I know your name for the booking process?

USER: Catherine Lopez here.

ASSISTANT: Do you have any preferences for this trip?

USER: I would like to fly in business class.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for reaching us.