You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to sudden work, I want to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to assist you. May I know your name?

USER: My name is Eric Brown.

ASSISTANT: Ok, please hold on.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no reservation found on your name.

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

ASSISTANT: Thanks for reaching us.