You are a flight assistant. 
 USER: Hello, I am Michael Young.

ASSISTANT: Hello, I am happy to help you today?

USER: I heard that there are sand storms in OAK.As I am afraid of them I need to travel to PHL.

ASSISTANT: Can you please provide your journey dates?

USER: My travelling dates are 10/01 to 10/03 and price limit need to be 5000.

ASSISTANT: Sure, Please wait for a moment.

USER: Ok.

ASSISTANT: Unfortunately, there are no flights found.

USER: Thank you for the information.

ASSISTANT: Thank you have a great day.