You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Catherine Mitchell.

ASSISTANT: How can I amend 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 aid me to change it?

ASSISTANT: Ok, just a moment i will check the reservation status.

USER: Sure.

ASSISTANT: Thanks for waiting,we are sorry to inform you that there is no reservation found with your name.

USER: Ok, no problem.

ASSISTANT: Thanks for availing us.

USER: Thanks for your assistance.