You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Cynthia Wright.

ASSISTANT: Ok.

USER: I want to change my travelling dates in my previous reservation. Can you please amend my existing reservation?

ASSISTANT: Sure please hold on a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there is no reservation found on given name.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.