You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,.

USER: I am Dorothy Davis. I would like to visit  Korean war veterans memorial on  weekend, which is at Washington DC-IAD. Can you please help me in booking with connected flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: My journey start on 08/09 and I arrival on 08/11.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Please provide your  source code.

USER: My boarding point is Oakland. OAK.

ASSISTANT: There is no flight found with your requirements.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.