You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Can you please book a flight ticket for me from LGA to LAS to attend a party?

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

USER: Thank you and my desired travel dates are Nov 21 and I will recur back on Nov 23.

ASSISTANT: Do you have any class preference?

USER: I would like to travel in business class.

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

USER: I need a single drop off in my journey.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your good name please?

USER: I am Jeffrey Mitchell.

ASSISTANT: Sorry, there is no flight available in this route.

USER: It's alright, thank you for your help.

ASSISTANT: You are welcome.

USER: Welcome.