You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Kenneth Green, I would like to visit PHL to attend a friend wedding, can you help me to find a flight from DEN?

ASSISTANT: Ok, please mention your trip dates too.

USER: My travelling dates are 04/22 and 04/24.

ASSISTANT: Sorry Kenneth Green, there is no flight on your route.

USER: It's ok, thanks for your help and information.

ASSISTANT: Welcome.