You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

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. Can you help me in change an existing reservation?

ASSISTANT: Sure, I will modify your reservation. May I know you name?

USER: I am Carol Williams.

ASSISTANT: Give me a minute, let me check and revert to you.

USER: Ok.

ASSISTANT: Sorry Carol, there was no reservation on your name in our database.

USER: OK.

ASSISTANT: Thank you for approaching us.