You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation, please help me out.

ASSISTANT: Sure, I can help you with that. May I know your good name please?

USER: I am Nancy Taylor.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Nancy, there is no reservation found under your name to do modifications in that.

USER: No issues, thanks for the help.

ASSISTANT: Thank you for reaching us.