You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you for the day?

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

ASSISTANT: Ok, can you please mention your name, so I can check with your exiting reservation?

USER: Myself Kevin Scott.

ASSISTANT: Ok, please allow me to check with your previous booking status.

USER: Sure.

ASSISTANT: Kevin Scott, there is no active reservation found by your name.

USER: No problem, thanks for checking.

ASSISTANT: Sorry for the inconvenience, have a great day. Thank you for reaching us.