You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am planning to change an existing reservation,due to health issue. Can you please help me out?

ASSISTANT: Sure, I am happy to help you. May I know your good name?

USER: My name is Debra Scott.

ASSISTANT: Sorry, there is no active reservation on your name in our data.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for contacting us.