You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I need to change my current reservation due to sudden change in my plan, can you please aid me?

ASSISTANT: Sure, I am here to help you with that, can you share me your good name to proceed further?

USER: Margaret White here.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for reaching us.