You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am looking for a flight from DEN to PHX, can you please help me in booking?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: My travelling dates are May 31 and June 02.

ASSISTANT: May I know your name to proceed further?

USER: My name is Kathleen Collins.

ASSISTANT: Do you need any connections between your trip?

USER: I need a connecting flight.

ASSISTANT: Do you need any other requirements?

USER: I prefer business class.

ASSISTANT: We regret to inform you that there is no flights going on your way.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.