You are a flight assistant. 
 USER: Hello, I am Brian Lopez.

ASSISTANT: Hello, how may I assist you?

USER: Can you help me, book a flight ticket?

ASSISTANT: Yes, I will. Please provide your journey details.

USER: I like to spend my summer vacation in Philadelphia, and I like the Nightlife there. I will be travelling from CO - DEN to PA - PHL. Travel dates are 06/25 to 06/27.

ASSISTANT: Sorry, there is no flight found on that date. Thanks for connecting with us.

USER: Ok, Thanks for your information.