You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Will you please help me to book a flight ticket from DTW to PHX?

ASSISTANT: Sure, we are glad to help you. Can I have your travelling dates?

USER: I will start on Apr, 20 and return on Apr, 22.

ASSISTANT: Do you prefer any break in between journey?

USER: Yes, I need a break.

ASSISTANT: Are there any other specifications for you?

USER: No, thank you.

ASSISTANT: May I know your good name?

USER: Jacob Jones here.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for availing us.