You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I am Samuel Parker. I am planning to visit Museum of Nature and Science at Denver, could you please help me with booking a flight ticket from PHL to DEN?

ASSISTANT: Sure, I will help you with that. Can you please provide your planned dates of your journey?

USER: I would like to take off on 12/31 and return on 01/02.

ASSISTANT: Sorry there are no flights on your planned dates.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Most welcome, thank you for reaching out here.