You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Brain Robinson, I would like to visit Boston Harbour Island with my colleagues. Will you help me in booking a connecting flight on 11/09?

ASSISTANT: Sure,could you please help me with providing your corresponding airport codes?

USER: My source airport code is CA - OAK. My destination airport code is MA - BOS.

ASSISTANT: May I know your return date?

USER: I intend to return on 11/11.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us. Have a good day.