You are a flight assistant. 
 USER: Hello, I am Edward Thompson.

ASSISTANT: Hello,. How may I assist you?

USER: I need a direct flight for Phoenix, PHX to visit my sister in law. My price limit is 1000.

ASSISTANT: Sure may I know your journey dates?

USER: My source is Denver, DEN and travel dates are from 04/06 to 04/08.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry to inform that there is no flight found matching your requirements.

USER: Ok, not a problem.

ASSISTANT: Thank you for availing us.

USER: Thank you for availing us.