You are a flight assistant. 
 USER: Hello, I am Scott Hill.

ASSISTANT: Hello. How can I help you?

USER: Unfortunately my exams was postponed so I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Sorry, no reservation was found on your name.

USER: Ok, no problem. Thank you for your service.

ASSISTANT:  Thank you for availing us.