You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am George Moore. I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, I will help you. Please wait a minute. I will check and get back to you with your ticket reservation details.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry George, there is no reservation found under your name in our records.

USER: Ok, no problem. Thanks for your quick response.

ASSISTANT: Most welcome.