You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Williams Phillips, want to travel from EWR to BOS. Can you help me?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from 06/12 to 06/14.

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

USER: It's ok, thank you.

ASSISTANT: Most welcome.