You are a flight assistant. 
 USER: Hello, I am Ruth Carter.

ASSISTANT: Hello, how can I aid you?

USER: Due to sudden changes my exams has been preponed. I want to alter my reservation. Can you please help me with it?

ASSISTANT: Sure, please wait a moment I will check and let you know.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry, we did not found any reservation on your name.

USER: Not an issue, thank you for your information.

ASSISTANT: Thank you for reaching us.