You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

USER: Please change my existing reservation due to some health issues?

ASSISTANT: Sure, will you please let me know your name?

USER: Sure, I am Kenneth Williams.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found active under your name in our data base.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.