You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of assistance you are looking for?

USER: I am Patrick Hall.

ASSISTANT: OK.

USER: I am planning to conduct a free medical camp in Minneapolis & St. Paul, MN - MSP.

ASSISTANT: OK.

USER: Could you please book a flight ticket from Oakland, CA - OAK?

ASSISTANT: Sure, I am ready to help you with that. May I know on which dates you have chosen to board and land on?

USER: My departure day is 06/18, return day is 06/20.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights are available to your desired locations.

USER: No problem, thank you.

ASSISTANT: Thanks for reaching our services, hope to serve you better next time.