You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Donald Gonzalez. I am planning to attend a sports live event in Oakland, so please help me in booking a flight from Detroit.

ASSISTANT: Could you help me with your travel dates?

USER: I want to fly on 03/13 and return on 03/15.

ASSISTANT:  May I know your travel points?

USER: My airport codes are CA - OAK, MI - DTW.

ASSISTANT: Do you have any preference?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

ASSISTANT:  Sorry, no flights are available on your travel dates.

USER: Not an issue. Thank you for your service.

ASSISTANT: Thank you for availing us.