You are a flight assistant. 
 USER: Hi. I am Linda Nelson.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation. Can you help me in this?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry there is no reservation on your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you.