You are a flight assistant. 
 USER: Hello, my name is Dorothy Clark.

ASSISTANT: Hello, how can I aid you?

USER: I want to go to my hometown for this vacation, can you help me to book a direct flight?

ASSISTANT: Sure. Please provide the journey details?

USER: Sure, I would like to travel from OAK to MSP.

ASSISTANT: Can I know your travelling dates?

USER: Yes, my travel dates are 08/25 and 08/27.

ASSISTANT: Do you have any limitations?

USER: Yes, my flight price should be within 500.

ASSISTANT: Unfortunately, we did not found any direct flights matching your criterion.

USER: Ok fine, don't proceed with my booking.

ASSISTANT: Thanks for opting us.

USER: Thanks for the information.