You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your name please?

USER: My name is James Evans.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

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

ASSISTANT: Thank you for availing us.