You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please make a airline reservation in business class?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable dates of travelling?

USER: My journey dates are on July 13th and 15th.

ASSISTANT: Ok, may I know your origin and destination airport codes for booking?

USER: My source and destination airport codes are, PHL to SFO.

ASSISTANT: Do you have any connection limit?

USER: I prefer a way station in between journey.

ASSISTANT: Any other requirements do you have?

USER: No.

ASSISTANT: On whose name I have to book the flight ticket?

USER: Please book a flight ticket with the name of Helen Wilson.

ASSISTANT: I am sorry to inform you that, non of the airlines is providing a flight on your travel dates and locations to book a flight ticket.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.