You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I best help you?

USER: I am Dorothy Smith. 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. Would it be possible to change my recent reservation?

ASSISTANT: Sure, we are here to help you. Please wait a moment I will revert you.

USER: Sure.

ASSISTANT:  Sorry, no reservation was found on your provided name.

USER: Ok, thank you for informing me.

ASSISTANT:  Thank you for availing us.