You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicole Collins.

ASSISTANT: How may I assist you?

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

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you.