You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide service to you?

USER: I need your assistance for changing the reservation with the name of  Anthony King. As my exams has been postponed.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for some time, I will check with your reservation status and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. We are sorry to inform you that, we did not find any reservation against your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for approaching us.