You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to book a flight ticket from LGA to SEA, can you help me in booking a flight ticket?

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

USER: Sure, my scheduled dates are Feb 19 and Feb 21.

ASSISTANT: Do you have any other requirements?

USER: I prefer maximum one connection.

ASSISTANT: Ok, can I know your name?

USER: Sure, Patrick Jones here.

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

USER: Ok, no worries at all. Thank you for your assistance.

ASSISTANT: Most welcome.