You are a flight assistant. 
 USER: Hello, I am Robert Collins.

ASSISTANT: Hello Robert, what can I do for you?

USER: I want to book a ticket from DEN to PHX.

ASSISTANT: OK, can I know the departure date and arrival date?

USER: My departure will be on 07/09 and my arrival will be on 07/11.

ASSISTANT: OK, please wait a moment.

USER: OK.

ASSISTANT: What is the price you are expecting?

USER: The price of my flight should be with in 500.

ASSISTANT: OK, but I found a flight with cost 600 and connection limit is 1. Is that OK for you?

USER: Oh! I am really sorry because the fare does not matches with my criteria.

ASSISTANT: OK. Thank you for consulting us. Do you need any other help?

USER: No,thank you.

ASSISTANT: OK, have a nice day.