You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  I am Kathleen Thompson. I want to change my existing reservation. Could you help me with that?

ASSISTANT: Sure, please hold on a moment.

USER: Ok.

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

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.