You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

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

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: My planned travel dates are in Apr from 21st to 23rd.

ASSISTANT: Ok, please let me know your preferable class.

USER: I prefer business class.

ASSISTANT: Can I have your good name please?

USER: Ashley Young here.

ASSISTANT: Do you have any more specifications?

USER: I want a single connecting flight.

ASSISTANT: Sorry Ashley Young, no flight is available to you in business class.

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

ASSISTANT: Thank you for choosing us, have a good day.