You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Amy Roberts. Can you please help me in changing my existing reservation details?

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Amy Roberts, no reservation was found by your name.

USER: It's ok, thank you for the information.

ASSISTANT: Sorry to trouble you. Have a nice day.