You are a flight assistant. 
 USER: Hi. I am Jonathan Green.

ASSISTANT: Hello, how can I be of your service?

USER: Due to the health illness of my granny, I am unable to catch a flight. So, I want to cancel my reservation. Can you help me?

ASSISTANT: Sure, give me sometime to check and get back to you.

USER: Ok.

ASSISTANT: Unfortunately we didn't found any reservation matching your name.

USER: That's fine. Thank you.

ASSISTANT: Thank you for picking us.