You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kevin Harris.

ASSISTANT: How can I help you today?

USER: I want to change my reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, I am gleeful to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: That's ok, thank you for checking.

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