You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Ronald Davis, want to travel from BOS to ORD. Can you please help me?

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

USER: My trip dates are from 01/10 to 01/12.

ASSISTANT: Please wait for a while.

USER: Ok.

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

USER: That's ok, thank you so much.

ASSISTANT: Most welcome.