You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I want to book a direct flight to meet my uncle at Las Vegas., can you help me with booking?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Thank you. I will fly on June 20 and return on June 22.

ASSISTANT: Ok, may I know your origin location?

USER: My origin airport code is PHL.

ASSISTANT: Ok, could I have your name please?

USER: I am Sarah White.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a direct flight.

ASSISTANT: Ok, may I know your class preference?

USER: No.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight with your requested connection limit.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome.