You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me to book a ticket from LAX to LAS?

ASSISTANT: Sure, let me know your travel dates please?

USER: My travelling dates will be on Dec 6 to Dec 8.

ASSISTANT: May I know your connection limit?

USER: I would like to travel in a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would prefer a well-known airline.

ASSISTANT: Can I know your name please?

USER: Joseph Green here. I would prefer economy class.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thanks for contacting us.