You are a flight assistant. 
 USER: Hello, I am Dennis Jackson. Due to bad weather the meeting has been postponed, I want to change my existing reservation. Can you please help me out?

ASSISTANT: Hello, how can I aid you? Sure, please wait I will let you know.

USER: OK.

ASSISTANT: Sorry, no reservation found on your name.

USER: Thanks for the information.

ASSISTANT: Thank you for availing us. Have a nice day.