You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please book a flight ticket from PHL to MSP?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Thank you. I have planned my travel dates as Oct 18 and Oct 20.

ASSISTANT: Can you please provide your name to proceed further?

USER: Sure, myself Patrick Campbell.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I would prefer business class.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Oh! It is sad to hear. Anyway, thank you for  your time.

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

USER: Most welcome.