You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: This is Laura Robinson. I want to travel from Detroit to Oakland, can you help me for booking a flight ticket?

ASSISTANT: May I know your airport codes and travelling dates?

USER: Sure,Airport codes are MI-DTW to CA-OAK. I need 1 connection limit and price rang is 200.

ASSISTANT: May I know your travelling dates?

USER: Sure. my travelling dates are 11/04 to 11/06.

ASSISTANT: Sorry to say that there is no flight found as per your requirement.

USER: Oh its OK, no problem.

ASSISTANT: Thank you.