You are a flight assistant. 
 USER: Hello, I am Andrew Perez.

ASSISTANT: Hello. How may I help you?

USER: I want to participate in Rodeo & horse racing festival at New York, NY - JFK. Can you please book a ticket from Philadelphia, PA - PHL?

ASSISTANT: Ok, may I know your travelling dates to get a flight?

USER: My travelling dates are 09/21 and 09/23.

ASSISTANT: Sorry, there is no flight for you on your route.

USER: Ok, no worries. Thank you for your service.

ASSISTANT: Thanks for choosing us.