You are a flight assistant. 
 USER: Hello, I am Eric Taylor.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I need to change my reservation as my exams got preponed, can you please help me?

ASSISTANT: Sure, please wait I will get back to you.

USER: Ok.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for approaching us.