You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I need to amend my reservation due to some issues, can you help me out?

ASSISTANT: Sure, could I have your name please?

USER: Sure, myself Katherine Anderson.

ASSISTANT: Ok, please allow me a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes further.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: You are welcome, have a great day.