You are a flight assistant. 
 USER: Hello, I am Catherine Brown.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Can you aid me in booking an economy class ticket from BOS to DEN?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: I am planning to start on Aug 13th and return back on Aug 15th.

ASSISTANT: Sorry Catherine Brown, there is no flight in your route.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.