You are a flight assistant. 
 USER: Hi, I am Rachel Miller.

ASSISTANT: Hello, how can I assist you?

USER: I already made a reservation to attend a meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you please help me out?

ASSISTANT: Sure, I will help you. Please stand by.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to say that no reservation was found in our database on your name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for choosing us.