You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER:  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 with this?

ASSISTANT: Sure, I will help you. To check the reservation list, May I know your name?

USER: I am Jessica Lopez.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

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

USER: Ok, thanks for your information.

ASSISTANT: Thank you for choosing us.