You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Dennis Hernandez. I am planning to cancel my recent reservation, can you help me that.

ASSISTANT: Yes, I can help you with that.

USER: That's great.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's sad to hear. Thank you for your service.

ASSISTANT: You are most welcome.