You are a flight assistant. 
 USER: Hello, Kathleen Clark here.

ASSISTANT: Hello, how can I support you today?

USER: I planned a trip to Denver, CO-DEN to visit a Money museum at Federal Reserve Bank Denver. So can you please help me in booking a flight ticket from PA-PHL?

ASSISTANT: Sure, let me know your journey dates.

USER: My journey dates are from Apr 20 to Apr 22.

ASSISTANT: Is there any connection limit for you?

USER: I prefer to travel in connecting flight.

ASSISTANT: In which class, you prefer to go?

USER: I prefer economy class.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for your time, no flights were found based on your schedule.

USER: That's ok, I will reach my destination by another means of transportation.

ASSISTANT: Thank you for choosing us.

USER: Thank you.