You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to change an existing reservation, can you please help me in that?

ASSISTANT: Sure, I will help you. Can I have your good name?

USER: My name is Sarah Rodriguez.

ASSISTANT: Please, wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name to change.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for availing us.