You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Ronald Edwards. I am looking for a flight from DEN to PHL, can you help me in booking the flight ticket from Denver?

ASSISTANT: Sure, can you provide me with the travel dates?

USER: Sure, my planned travel dates are Dec 23 and Dec 25.

ASSISTANT: Give me a moment please.

USER: Sure, I will wait for your response.

ASSISTANT: Spirit airlines with flight 1015 is providing service on your route with a single connection.

USER: I am looking for a business class flight. Can you look for it?

ASSISTANT: Let me check for you. Sorry, there are no flights available with this class.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you approaching us.