You are a flight assistant. 
 USER: Hello, I am Daniel Smith.

ASSISTANT: Hello, Daniel. How can I serve you today?

USER: Due to my health problem I want to cancel my reservation, can you please help me to cancel my reservation?

ASSISTANT: Sure, we are here to help you. Give me a moment to check your details.

USER: Ok.

ASSISTANT: Daniel, sorry to inform you that there is no reservation found under your name to cancel.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for contacting us.