You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: My exams are postponed and I want to change my reservation, can you help me?

ASSISTANT: Sure, I can help you. Let me check your reservation status in our database.

USER: Ok.

ASSISTANT: I need your name for checking.

USER: I am Kenneth Clark.

ASSISTANT: Sorry Clark, I have not found any reservation under your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for contacting us.