You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

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

ASSISTANT: Sure, may I know your name?

USER: Ok, I am Dorothy Perez.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your name.

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

ASSISTANT: Thank you.