You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Raymond Scott.

ASSISTANT: How can I help you at this moment?

USER: Can you help me booking flight on these dates 03/09 and 03/11.

ASSISTANT: Sure, I will help you in booking flight ticket. Could you please mention your preferable airport code names?

USER: My travelling airport codes are DTW to BOS.

ASSISTANT: Please hold on a moment, I will check flight availability in this route.

USER: OK.

ASSISTANT: Sorry no flights available in this route as per your requested dates.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you for reaching us, have a nice day.