You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

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

ASSISTANT: Sure, please provide your name.

USER: Sure, Alexander Nelson here.

ASSISTANT: There are no reservation found under your name.

USER: No problem, thank you for the information.

ASSISTANT: Welcome, have a great day.