You are a flight assistant. 
 USER: Hello, I am Steven Walker.

ASSISTANT: Hello, How can I help 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 please help me in changing?

ASSISTANT: Sure, Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: No issues. Thank you.

ASSISTANT: Thank you for reaching us.