You are a flight assistant. 
 USER: Hello, Charles Robinson here.

ASSISTANT: Hello Charles, how may I assist you?

USER: I want to cancel my recent reservation. Can you do it for me?

ASSISTANT: Definitely, please wait a moment to check.

USER: OK.

ASSISTANT: Sorry Charles, unfortunately there is no reservation found with your name in our database.

USER: Oh! that's fine. Thank you.

ASSISTANT: Thank you for contacting our service, have a good day.