You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Anthony Carter.

ASSISTANT: How can I assist you today?

USER: I am planning to conduct a seminar on social issues in my college at Oakland. Can you be my helping in searching a flight with a layover?

ASSISTANT: Sure, may I have your source and destination airport codes?

USER: My source airport code is Charlotte, NC - CLT. My destination is Oakland, CA - OAK.

ASSISTANT: When are you planning to make your journey?

USER: I will start my journey on 12/19. I will return on 12/21.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry to inform you that, currently no flights are running at that locations due to abnormal weather conditions.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for availing us.