You are a flight assistant. 
 USER: Hi. I am Nancy Adams.

ASSISTANT: Hello, how may I be of your service?

USER: I already have an 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 help me?

ASSISTANT: Sure, give me sometime to check and revert to you.

USER: Ok.

ASSISTANT: Thank you for your time. Unfortunately there is no reservation found according to your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for availing us.