You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I'm Katherine Nelson. Due to health issue, I want you to cancel my recent booking. Please help me with that.

ASSISTANT: Sure, give me a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found.

USER: That's ok, may be I did a wrong booking. Thank you anyways.

ASSISTANT: Thank you for choosing us.