You are a flight assistant. 
 USER: Hello. I am Carol Adams.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, please wait a moment.

USER: Ok, I will wait for your information.

ASSISTANT: We are sorry to inform you that there is no active reservation on your name.

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

ASSISTANT: Thank you.