You are a flight assistant. 
 USER: Hello, I am Ruth Phillips.

ASSISTANT: Hello, we are glad to serve you.

USER: Due to bad weather, The meeting has been postponed. Can you change my existing reservation?

ASSISTANT: Sure, please wait a moment, let me check your reservation and get back to you.

USER: OK.

ASSISTANT: Sorry, unfortunately no reservation found with provided name.

USER: Thanks for the information.

ASSISTANT: Pleasure to serve you, thanks for opting us.