You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Benjamin Philips, help to find a flight from IAD to OAK for two days vacation at Oakland.

ASSISTANT: Yes, I am here to help you. Please share your further details.

USER: I need a direct flight from Washington DC. My travel dates are 10/13 and returning on 10/15.

ASSISTANT: Can I have your name please?

USER: Sure, Benjamin Philips.

ASSISTANT: Sorry, there is no flight found according to your criterion.

USER: Ok, thanks for the information.

ASSISTANT: Thanks for opting us.