You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I assist you today?

USER: I am Catherine Walker.

ASSISTANT: Ok.

USER: I am planning to conduct a free medical camp in Detroit, MI - DTW, so please book a flight ticket from Oakland, CA - OAK.

ASSISTANT: Ok, I will book you a ticket. Please provide the travel dates.

USER: I will start on 09/30, return on 10/02.

ASSISTANT: Ok. Thanks for the details. We are sorry to inform you that, no flights will run on respective days.

USER: No problem, thanks for your service.

ASSISTANT: Thanks for choosing us.