You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from BOS to CLT, can you help me out?

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

USER: My trip dates are from Apr 19th till Apr 21st.

ASSISTANT: Do you have any other requirements?

USER: I am looking for a direct flight.

ASSISTANT: Can I know your name please?

USER: Myself Michael Lopez.

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

USER: That's ok, not an issue. Thank you.

ASSISTANT: Most welcome.