You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket to go for a vacation with my friend.

ASSISTANT: Sure, may I know your journey details?

USER: OK,. I want to start from Detroit, MI-DTW on 04/02 to Oakland, CA-OAK on 04/04.

ASSISTANT: OK, please wait a moment.

USER: Sure,.

ASSISTANT: Thanks for waiting, no flight is found with your given information.

USER: Thank you for your service.

ASSISTANT: May I know your name?

USER: I am Samuel King.

ASSISTANT: Thank you, for connecting with us.