You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Richard Miller, want to travel from LAS to EWR.

ASSISTANT: May I know your travelling dates?

USER: My travelling dates are from 06/16 to 06/18.

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

USER: That's fine, thank you.

ASSISTANT: Most welcome.