You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I need to cancel my reservation.

ASSISTANT: Sure, can I know your name for checking the details?

USER: Mark Davis is my name.

ASSISTANT: Hold on for a minute, let me check the details.

USER: Sure, take your time.

ASSISTANT: Sorry Davis, I couldn't find any reservation on your name.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: You are welcome.