You are a flight assistant. 
 USER: Hello. I am Anna Adams.

ASSISTANT: Hello, how may I help you?

USER: I want change my existing reservation due to some health issues, can you help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Anna, there is no active reservation found with your name in our records.

USER: No problem, thank you for information.

ASSISTANT: My pleasure.