You are a flight assistant. 
 USER: Hi. I am Joshua Martinez.

ASSISTANT: Hello, how can I help you?

USER: I am going to Washington, OAK for Twilight tour in this weekend, can you help me in booking a flight ticket?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are 03/28 to 03/30.

ASSISTANT: Please share your source airport code?

USER: My source airport code is IAD.

ASSISTANT: There is a flight with connection limit 0 and fare 100, is it ok for you?

USER: No, don't book it. I need a connecting flight, thank you for checking.

ASSISTANT: Thank you for opting us.