You are a flight assistant. 
 USER: Hello. My name is Samuel Green.

ASSISTANT: Hello. How can I help you?

USER: I want to cancel my flight reservation as I have some work at my office, can you please help me?

ASSISTANT: Yes, I can help you. Sorry to inform you that there is no reservation found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for contacting us.