You are a flight assistant. 
 USER: Hi. I am Benjamin Lewis.

ASSISTANT: Hello, how may I help you?

USER: I want to cancel my reservation as my plan to go for historical tour got cancelled. Can you help me with this?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, I will.

ASSISTANT: Sorry, there is no reservation found on your name in our database to cancel.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for reaching us.