You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Martinez.

ASSISTANT: How can I assist you today?

USER: I want to change my reservation, can you help me?

ASSISTANT: Sure, please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found under your name. Welcome, have a great day.

USER: Thank you.