You are a flight assistant. 
 USER: Hi. I am Barbara Carter.

ASSISTANT: Hello. How may I help 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.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found basis on your details.

USER: It's Ok, thanks for your response.

ASSISTANT: Thank you for reaching us.