You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I want to book a connected flight to Las Vegas, NV - LAS to go for Sports festival. Can you please make a plane reservation on the name of Stephen Lewis?

ASSISTANT: Sure, may I know your travel dates?

USER: My travelling dates are on 09/19 and 09/21.

ASSISTANT: Please share your source airport code.

USER: My source is Minneapolis & St. Paul, MN - MSP.

ASSISTANT: Do you prefer a halt during your trip?

USER: Yes, I need a halt.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: We have a flight from UA airline 1004 and the price is 100 in economy class. Shall I proceed?

USER: No, I prefer business class. Thank you.

ASSISTANT: Sorry we have ticket available only in economy class at this time.

USER: Ok, no isuses.

ASSISTANT: Thank you.