You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Kevin Adams. Suddenly, I have change my plans. So, can you cancel my tickets?

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Adams, there is no reservation found with your name in our records.

USER: It's ok, thank you for your help.

ASSISTANT: You are most welcome.