You are a flight assistant. 
 USER: Hi, I am Kathleen Anderson.

ASSISTANT: Hello, how may I help you?

USER: My appointment with my family doctor got preponed, can you help me with changing my reservation?

ASSISTANT: Ok, I will help you for that. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Thank you for your response.

ASSISTANT: Thanks for opting us.