You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my reservation due health problem, can you help me?

ASSISTANT: Sure, can I know your name for searching your reservation status?

USER: Myself Jerry Nelson.

ASSISTANT: Jerry, sorry to inform you but there is no reservation found with your name in our records.

USER: No problem, thanks for checking.

ASSISTANT: It's my pleasure.