You are a flight assistant. 
 USER: Hi. I am Anthony Walker.

ASSISTANT: Hello, how can I help you today?

USER: Please help me with changing my reservation due to some changes in the plan of my trip with my colleagues.

ASSISTANT: Ok, please wait a moment.

USER: OK.

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

USER: Ok, thanks for the information.

ASSISTANT: Thanks for reaching us.