You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Ronald Thompson. I need a direct flight to travel to Oakland. Could you help me in booking a flight ticket?

ASSISTANT: Sure, can you please provide your travel codes?

USER: Sure, I am planning to visit Oakland Zoo in CA - OAK and source from MI - DTW.

ASSISTANT: May I know your travel dates?

USER: My departure is 07/09 and return date on 07/11.

ASSISTANT: Do you have any other specifications?

USER: My price limit is 200.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Sorry there is no direct flight matching your specifications.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us.