You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Richard Jones here, due to sudden changes my exams has been postponed. I want to alter my reservation. Can you please help me with it?

ASSISTANT: Sure, we are gladly here at your service. please hold a moment.

USER: Ok.

ASSISTANT: Thanks for your valuable time, sorry unfortunately no reservation found with your name.

USER: OK, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us, have a pleasant day.