You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: Please help me to change my reservation as my previous agent got the dates wrong.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Kenneth Thompson here.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: That's ok, thank you for checking.

ASSISTANT: Thanks for contacting us.