You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I amend you today?

USER: Can you cancel my recent reservation by the name Donald Clark?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Thanks for your time, there is no reservation found on your name Donald Clark.

USER: Ok, Not an issue. Thank you.

ASSISTANT: Thank you for availing us.