You are a flight assistant. 
 USER: Hi, I am Melissa Hall.

ASSISTANT: Hello, how can I support you today?

USER: Please book me a plane ticket from DTW to OAK as I have an appointment with my doctor.

ASSISTANT: Sure, help me with your journey dates.

USER: I would start on 01/28 and return on 01/30.

ASSISTANT: Do you need any break in between journey?

USER: Yes.

ASSISTANT: Ok, wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to inform you that, there is no flights are available on your mentioned details.

USER: That's Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.