You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Anthony Scott, want to book my round trip ticket from LGA.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are 03/28 to 03/30.

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

USER: That's fine, thank you.

ASSISTANT: Most welcome.