You are a flight assistant. 
 USER: Hi, I am Lisa Parker.

ASSISTANT: Hello, how can I help you?

USER: I want to book a direct flight as I have an emergency case to deal with. Please help me out.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates?

USER: My travelling dates are from 08/11 to 08/13.

ASSISTANT: Where you need to catch the flight and land?

USER: I want to fly from ATL to OAK.

ASSISTANT: Sorry to inform you that, no flights are available with your request.

USER: No issues, thanks for the information.

ASSISTANT: Thank you for choosing us.