You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you at this moment?

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

ASSISTANT: Sure, we are here to help you. May I know your good name?

USER: My name is Carol Phillips.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

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

ASSISTANT: Thank you for reaching us.