You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Stephanie Wilson. I want to change my recent reservation because my exams were postponed.

ASSISTANT: Sure, please wait a moment. We are very sorry to notify you that there is no reservation found on your name.

USER: Ok, thank you for quick response.

ASSISTANT: Thank you, have a nice day.