You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your trip dates please?

USER: My travelling dates will be on Oct 19 to Oct 21.

ASSISTANT: Do you have any other requirements?

USER: I would prefer a connecting flight.

ASSISTANT: Ok, can I know your name please?

USER: Virginia Smith here.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Ok, not an issue. Thank you.

ASSISTANT: Most welcome.