You are a flight assistant. 
 USER: Hello, I am Donald Young.

ASSISTANT: Hello, how shall I help you?

USER: I already have an reservation to attend for a meeting, due to some technical issues the meeting place has been changed. Can you help me to change my recent reservation?

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: No reservation found by name Donald Young. Thanks.

USER: That's Ok, not a problem.