You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I would like to book a ticket from DEN to PHX, can you please help me out?

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

USER: I am travelling on these dates May 8th and 10th.

ASSISTANT: Ok, please let me know your good name.

USER: Jeffery Johnson here.

ASSISTANT: Do you have any specifications to get best flight for you?

USER: I need single connected flight. I don't have any other preferences.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Jeffery Johnson, no flight is available to you on your planned dates.

USER: Ok no problem, thank you for your services.

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