You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Yes, I would like to book a flight ticket from  to attend a robotic workshop at Atlanta. Can you help me to book an business class ticket?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Yes, I want to depart on June 25 and intend to return on June 27.

ASSISTANT: Ok, may I know your origin location airport code?

USER: Yes, it is  SFO.

ASSISTANT: Ok, could I have your name please?

USER: Yes, my name is Robert Clark.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a direct flight.

ASSISTANT: Ok, do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's ok, thank you for the response.

ASSISTANT: You are welcome, have a great day.