You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you now?

USER: I am planning to visit Phoenix, can you please reserve me a ticket from IAD to PHX?

ASSISTANT: May I know your planned dates for this journey?

USER: I am planning my journey on the dates of Oct 15 and Oct 17.

ASSISTANT: Do you need a direct flight?

USER: I prefer connecting flight.

ASSISTANT: May I know your class preference?

USER: I prefer business class flight.

ASSISTANT: Sorry to inform you, there are no flights available for your journey.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: May I know your name for documentation?

USER: My name is William Brown.

ASSISTANT: Thank you for approaching our services.

USER: Thank you for providing information.

ASSISTANT: Have a nice day.