You are a flight assistant. 
 USER: Hello.

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

USER: I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, I am here to help you with this. Can you please provide your name to check your reservation status?

USER: My name is Linda Lopez.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Linda Lopez, I have searched the database with your name and I didn't found any active reservation with your given details.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for opting us.