You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to attend music concert at ATL, can you please help me with booking a flight ticket from SFO?

ASSISTANT: Sure, may I know your good name?

USER: My name is Paul Moore.

ASSISTANT: Do you have any class preference?

USER: I prefer economy class.

ASSISTANT: Do you prefer a connecting or direct flight?

USER: I need connection flight.

ASSISTANT: Please help me with your journey dates.

USER: Sure, I would like to take off on Apr 21 and return on Apr 23.

ASSISTANT: Is there any more specifications?

USER: No.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure, take your time.

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

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for availing us, have a good day.

USER: You are welcome.