You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Paul Wilson here.

ASSISTANT: How can I assist you at this moment?

USER: I want to meet my Facebook friend in Philadelphia. Could you book my ticket from DEN to PHL?

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

USER: My itinerary dates 11/21 and 11/23.

ASSISTANT: Ok, please be hold on for a moment.

USER: Sure.

ASSISTANT: Yes, I have found a flight in AA airlines with connection 0 and price 200, is it ok for you?

USER: I need a connecting flight.

ASSISTANT: Sorry Paul Wilson, no flight is available to you with connection 1.

USER: It's ok, thank you for helping me.

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