You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What can I do for you?

USER: I am Mary Adams, I have a change my reservation due to my illness. Can you help me?

ASSISTANT: Sure, Please wait for sometime.

USER: Ok.

ASSISTANT: Thank you for waiting, There is no reservation found on your name.

USER: Thanks for the information.

ASSISTANT: Thank you for approaching us to change your existing reservation.