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

ASSISTANT: Hello, how can I help you?

USER: I need to book a direct flight from Oakland to meet my Uncle, so please assist me in booking a flight within a fare of 500.

ASSISTANT: Sure, I am here to assist you.

USER: Ok.

ASSISTANT: May I know when you want to travel?

USER: I want to travel on 09/20 to 09/22.

ASSISTANT: Ok, please help me with your airport codes.

USER: My airport codes are OAK - MSP.

ASSISTANT: Wait a minute please.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform no flights found with your details.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for reaching us, have a nice day.