You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need some changes in my existing reservation, can you help me with this?

ASSISTANT: Sure, may I know your name?

USER: Angela Walker is my name.

ASSISTANT: Ok, please wait a moment.

USER: OK.

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

USER: Ok, that's not a problem. Thanks for the information.

ASSISTANT: Thanks for reaching us.