You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning. How can I help you today?

USER: I am Elizabeth Evans. There was a seminar of my son but due to health issue, I want to change my reservation.

ASSISTANT: Sure. Let me check.

USER: Ok.

ASSISTANT: Sorry Evans, I have not found any reservation by your name.

USER: That's ok. Thank you for searching.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Welcome.