You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to my health problem I want to cancel my recent reservation, can you please help me to cancel my reservation?

ASSISTANT: Sure, can you please tell me your name?

USER: My name is Karen Evans.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Most welcome.