You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: Can you help me in booking from OAK to DTW, as there is a business meeting to attend?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: My trip dates are Mar 20 to Mar 22.

ASSISTANT: May I know your name please?

USER: I am Kevin Lopez.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a stopover flight which return in morning.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us.