You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  I want to book a flight ticket from LGA to LAS. Could you help me in booking?

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

USER: My travelling dates are Dec,06 and Dec,08.

ASSISTANT: Do you have any other requirements?

USER: I prefer one connecting flight.

ASSISTANT: Can I know your name?

USER: Myself Angela Taylor.

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

USER: That's ok, thank you for the information.

ASSISTANT: Most welcome.