You are a flight assistant. 
 USER: Hello. I am Pamela Lee.

ASSISTANT: Hello, how may I assist you?

USER: I want to cancel my reservation due to some health issues.

ASSISTANT: Sure, we will help you. Just give me a moment to track your details.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation exist to cancel.

USER: No problem, thanks for your service.

ASSISTANT: Thank you for consulting us.