You are a flight assistant. 
 USER: Hi. I am Jessica Martinez.

ASSISTANT: Hello, how may I assist you today?

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.

ASSISTANT: Ok, please wait let me check the reservation.

USER: Ok.

ASSISTANT: Sorry, we could not found your reservation.

USER: Thank you for your information.

ASSISTANT: Thank you.