You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Katherine Walker here.

ASSISTANT: How can I help you Walker?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you. Please give me a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry, no reservation found on your name.

USER: Anyway, thanks for the information.

ASSISTANT: My pleasure.