You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket from PHL to SFO for attending a event.

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My travelling dates are Mar 19 and Mar 21.

ASSISTANT: Ok, please share your name.

USER: I am Michael Baker.

ASSISTANT: Let me know your connection limit.

USER: I prefer to travel in a connecting flight.

ASSISTANT: Do you have any specification?

USER: I prefer to travel in a business class.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: No worries, thank you for the information.

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