You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are 17 and 19 of June.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Do you have any particular time for departing and returning?

USER: No.

ASSISTANT: May I know your good name please?

USER: I am William Wright.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.