You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Green.

ASSISTANT: How can I assist you now?

USER: I planned to attend for a seminar in DEN, can you please help me to book a flight ticket from BOS?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: I prefer to travel on Nov 10 and Nov 12.

ASSISTANT: Ok Paul Green, do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Sorry Paul Green, no direct flight is available to you on your dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.