You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Mary Nelson here.

ASSISTANT: How can I aid you today?

USER: I am looking for a business class flight for my holiday trip to Phoenix. Can you book the flight ticket?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: The trip dates are from 20 Nov to 22 Nov.

ASSISTANT: Ok, can you please provide your airport codes?

USER: My airport codes are from SEA to PHX.

ASSISTANT: Ok, do you have any other specifications?

USER: I am looking for a single connecting flight.

ASSISTANT: Ok, hold on for a moment. Let me check the best available flight for you.

USER: Sure.

ASSISTANT: May I know your name please?

USER: I am Mary Nelson.

ASSISTANT: Sorry Mary Nelson, there are no flights available on your requested dates.

USER: Not a problem. Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.