You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my reservation as I made my reservation on wrong dates. Can you help me?

ASSISTANT: Sure, please provide me your name.

USER: I am Linda Hall.

ASSISTANT: Please wait a moment.

USER: Siure.

ASSISTANT: Sorry, there are no active reservations on your given name to change.