You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Patricia Lopez.

ASSISTANT: How may I assist you Lopez?

USER: I just need your help in changing my reservation details.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please wait a moment to check your previous reservation status.

USER: Ok.

ASSISTANT: Sorry to inform you that, there is no reservation found with your name in our records.

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.