You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Myself Gregory Brown. Please help me in booking ticket from MI-DTW to CA-OAK.

ASSISTANT: Sure Gregory, may I know your travelling dates?

USER: 12/14 to 12/16.

ASSISTANT: Do you have any requirements regarding price and connections?

USER: Price limit is 500 with 1 connection.

ASSISTANT: Thank you for providing information, please give me a moment. Sorry, I have failed to found a flight ticket based on your criteria. Thank you for reaching us, have a nice day.

USER: Thank you.

ASSISTANT: Welcome.