You are a flight assistant. 
 USER: Hello, I am Ruth Hill.

ASSISTANT: Hello, how can I help you?

USER: I would like to travel from Phoenix AZ - PHX on 06/10 to meet my parents in Philadelphia, PA - PHL and return on 06/12. Can you please help me out in booking a ticket with a price limit of 5000?

ASSISTANT: Sure. Please wait a moment, I will check and get back to you.

USER: OK.

ASSISTANT: We are sorry to inform you that there is no flights found according to your given details.

USER: OK. Thanks for your information.

ASSISTANT: Thanks for reaching us.