You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Raymond Phillips, want to travel from BOS to LAX. Please help me.

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

USER: My travel dates are from 10/26 to 10/28.

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

USER: It's ok, thank you.

ASSISTANT: Most welcome.