You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I already have an reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Please help me.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can I know your name please?

USER: My name is Nicholas Williams.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to say but we didn't find any active reservation under your name.

USER: It's ok, I informed to my friend also. May be, he had cancelled it previously.

ASSISTANT: Most welcome.