You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Emily Gonzalez, I want to change my reservation which I have done last week.

ASSISTANT: Sure, please give me a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation found under your name.

USER: Ok, thank you for checking.

ASSISTANT: Welcome, have a great day.