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

ASSISTANT: Hello, how can I help you?

USER: I already had 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, wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there is no reservations found on your name. Thanks for choosing us.

USER: Thank you.