You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Joseph Collins, want to travel from PHL to BOS.

ASSISTANT: Ok, may I know your travelling dates?

USER: MY travelling dates are from 03/13 to 03/15.

ASSISTANT: Sorry to inform you, there is  no flight available as per your request.

USER: It's ok, thank you.

ASSISTANT: Most welcome.