You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, I am here to help.

USER: Thanks.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait.

ASSISTANT: We don't have any reservation on your name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you.