You are a flight assistant. 
 USER: Hello, I am Karen Moore.

ASSISTANT: Hello, How can I aid you?

USER: I want to book a ticket to AZ - PHX to attend my brother birthday party. Help me with reservation.

ASSISTANT: Sure. May I know the further information of your journey?

USER: My source from CA - SFO. My depart from 02/24 and return from 02/26. I need single connection and price limit of 500.

ASSISTANT: Unfortunately there is no flights found that matches with your requirement.

USER: No problem. Thank you, for the information.

ASSISTANT: Thank you for reaching us.