You are a flight assistant. 
 USER: Hello. I am Kathleen Roberts.

ASSISTANT: Hello, how can I help you today?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thanks for reaching us.