You are a flight assistant. 
 USER: Hello, I am Janet Perez.

ASSISTANT: Hello, how may I best serve you today?

USER:  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 in changing the reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to change your reservation.

USER: Ok, not an issue. Thanks for the information.

ASSISTANT: Thanks for contacting us.