You are a flight assistant. 
 USER: Hello. I am Gary Green.

ASSISTANT: Hello, how may I help you?

USER: Due to health issues, I want to cancel my reservation. Can you help me?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry there is no reservation found on your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us, take care.