You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Anthony Baker. I want to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, please wait for a while.

USER: Sure, I will wait for your response.

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

USER: That's ok, thank you for your information.

ASSISTANT: My pleasure.