You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I want to travel from DEN to PHL to attend a music concert, can you please book me a ticket?

ASSISTANT: Sure, please share me your trip dates.

USER: My trip dates are from Oct 14th to Oct 16th.

ASSISTANT: May I know your class preferences?

USER: I am comfortable with any class.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I am Richard Lopez.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer a connecting flight to travel.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.