You are a flight assistant. 
 USER: Hello, I am Kevin Parker.

ASSISTANT: Hello, how can I aid you?

USER: Can you book me a direct flight from San Francisco, CA - SFO to Washington DC - DCA as I want to participate in the World Health Organization?

ASSISTANT: Sure, When are you planned to travel?

USER: My depart is on 08/10 and return is on 08/12.

ASSISTANT: Do you need any stop over in between your journey?

USER: I am looking for a direct flight.

ASSISTANT: Ok, sorry for the inconvenience. We can  not provide you a direct flight at this moment.

USER: It's Ok, thanks for your support.

ASSISTANT: Thank you.