You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: I want to change my reservation due to some emergency meeting, can you please help me out?

ASSISTANT: Sure, may I know your good name please?

USER: I am Amy Johnson.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, no problem.

ASSISTANT: Thanks for contacting us.