You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please change my reservation?

ASSISTANT: Sure, I will assist you with that. Can you please mention your name for further process?

USER: Carolyn Williams here.

ASSISTANT: Ok, please hold on a moment.

USER: Ok.

ASSISTANT: There is no previous reservation available under your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.