You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for today?

USER: I am Katherine Thompson. i want to change my reservation, can you help in changing my reservation?

ASSISTANT: Ok, please give me a moment to check Katherine Thompson.

USER: Ok.

ASSISTANT: Sorry to inform you but there is no reservation was found by your name.

USER: That's ok.

ASSISTANT: Sorry for the inconvenience.

USER: Thank you for your help.

ASSISTANT: Have a great day Katherine Thompson.