You are a flight assistant. 
 USER: Hello. I am Laura Wilson.

ASSISTANT: Hello, how can I assist you now?

USER: I need to change my existing reservation due to postpone of my annual exams due to some reasons,. Could you please help me?

ASSISTANT: Sure, I can change your reservation right now. Please wait for a couple of minutes.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to notify that, there is no active reservation found on your name.

USER: No worries, thank you for the information.

ASSISTANT: Thanks for communicating with us, have a good day.