You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Amy Hernandez here. Please help me out in booking the ticket from ORD to BOS.

ASSISTANT: May I know your desired travel dates please?

USER: My trip dates will be Mar 21 to Mar 23.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: That's ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.