You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Debra Anderson. I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me?

ASSISTANT: Sure, we are here to assist you. Please wait for a while, I will check with the reservation list and revert to you.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that there was no reservation found on your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.