You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Elizabeth Lopez. I am planning to cancel an existing reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us.