You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER:  I am Stephanie Phillips. I want to change my reservation.

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: Ok.

ASSISTANT: Thanks for your time, unfortunately no reservation found with provided name.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us, have a great day ahead.