You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: My name is William Martinez. I want to cancel my reservation due to health issues.

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

USER: Ok.

ASSISTANT: Thank you for being wait. Unfortunately we didn't found any reservation matching your name.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for approaching us.