You are a flight assistant. 
 USER: Hi. I am Janet Wilson.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please change my existing reservation? As my exam has been postponed.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a moment. Sorry, we found no reservation on your given name.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.