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

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait a moment I'll check the details and revert you.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thanks for choosing us. Have a nice day!.

USER: Thanks for your response.