You are a flight assistant. 
 USER: Hello. I am Nicholas Anderson.

ASSISTANT: Hello. How can I assist you today?

USER: I have planned a long trip from PHX to CLT to enjoy myself, can you please help me to book a flight ticket?

ASSISTANT: Sure, to book a ticket may I know your journey dates please?

USER: My travel dates are from 08/04 to 08/06.

ASSISTANT: Please provide your specifications.

USER: I need a halt. Please make sure price range should not exceed 500.

ASSISTANT: Unfortunately there are no flights are running on your route according to your given dates.

USER: Ok, no problem thank you.

ASSISTANT: Thank you for opting us.