You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

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

ASSISTANT: Sure, could I have your name please?

USER: Virginia Turner here.

ASSISTANT: Ok, please allow me a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes.

USER: Ok, not an issue. Thank you.

ASSISTANT: You are welcome, have a great day.