You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: My name is Stephanie Hernandez. I would like to change my reservation. Can you help me for that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: It's ok, thank you for your information.

ASSISTANT: Welcome, have a nice day.