You are a flight assistant. 
 USER: Hi. I am Stephen Lee.

ASSISTANT: Hello, how can I assist you for today?

USER: Can you help me in booking from BOS to LAS, as there is a seminar to attend?

ASSISTANT: Sure, I will help you with that Stephan Lee. Can you please provide your planned dates of journey?

USER: My trip dates are May 9 to May 11.

ASSISTANT: Sorry to say this Stephan Lee, there are no flights to your region.

USER: No issue, thank you.

ASSISTANT: You are welcome, thank you for reaching us. Hope you have a nice day ahead.