You are a flight assistant. 
 USER: Hello,. I am Virginia Roberts.

ASSISTANT: Hello Roberts, how can I help you today?

USER: I want to book a flight ticket to go for a Grand Canyon Adventure in Philadelphia, PA - PHL. Can you please make a flight reservation from Denver, CO - DEN?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: On which dates you want me to book your ticket?

USER: My depart date is on 03/05 and return date is on 03/07.

ASSISTANT:  Sorry to notify that, there is no flight found on your requested dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.