You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at this moment?

USER: I planned to meet my friend in SFO, can you please help me to book a flight ticket from ATL?

ASSISTANT: Sure, could I have your travel dates, please?

USER: Sure, my planned travelling dates are June 20 and June 22.

ASSISTANT: Do you prefer a connecting or direct flight?

USER: I am looking for a direct flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: Sure, my name is Michael Johnson.

ASSISTANT: Ok, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for choosing us, hope to serve you again.