You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you?

USER: I am Barbara Evans. I want to change my recent reservation due to health problem. Help me in changing my reservation.

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: There is no reservation on your name.

USER: Its ok, thank you.

ASSISTANT: Thank you for availing us.