You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Anthony Mitchell.

ASSISTANT: How can I aid you?

USER: I have to attend a Live Concert at San Francisco, could you please help me with booking a flight ticket from ATL to SFO?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: I would like to depart on Sept 15th and return on Sept 17th.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting. There are no flights found on your data.

USER: That's ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you.