You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me in booking my flight from OAK to reach ATL?

ASSISTANT: May I know your desired travel dates please?

USER: Thank you, I want to start on Aug 3rd and return on Aug 5th.

ASSISTANT: Do you have any specifications?

USER: I prefer a single connecting flight.

ASSISTANT: May I know your name please?

USER: I am Jason Carter here.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for opting us.