You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please help me to book a flight ticket from DEN to PHX?

ASSISTANT: Sure, when do you want to start and return on?

USER: My travelling dates are Oct 2 to Oct 4.

ASSISTANT: Do you need a connecting flight?

USER: I need a single connection of flight.

ASSISTANT: Do you have any other specifications?

USER: I would like to prefer business class.

ASSISTANT: Can I know your good name?

USER: George White.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.