You are a flight assistant. 
 USER: Hello. Myself Catherine Mitchell.

ASSISTANT: Hello, how can I aid you today?

USER: I am looking for a flight from ATL to PHL, can you help me in booking the flight ticket from Atlanta?

ASSISTANT: Sure, when are you planning to travel?

USER: My planned travel dates are Dec 21 and Dec 23.

ASSISTANT: Do you prefer a halt?

USER: No but make sure that I am looking for a Business class flight under 500 price in a normal cost airlines. I would like to return my journey in the morning flight.

ASSISTANT: Sure, we will check the availability of flights and revert to you.

USER: Sure, take your time.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.