You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Johnson.

ASSISTANT: How can I assist you today?

USER: I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: Mary, there is no reservation found under your name to do cancellation.

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

ASSISTANT: Thank you for reaching us.