You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Rebecca Roberts, want to travel from BOS to ATL. Please help me.

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are from 08/15 to 08/17.

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

USER: That's fine, thank you.

ASSISTANT: Most welcome.