You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Donna Thomas. I want to change my existing reservation due to my exams dates were changed. Can you help me out?

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found with your name.

USER: Not an issue. Thank you for your information.

ASSISTANT: Thank you.