You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Angela Wilson.

ASSISTANT: How may I support you at this moment?

USER: I would like to conduct a medical camp in Oakland, OAK. Can you please reserve a flight ticket with connecting flight?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My journey start on 10/11 and return back on 10/13.

ASSISTANT: Please share your source airport code?

USER: My boarding point is Washington, DCA.

ASSISTANT: There are no flights available on your requested dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.