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, may I know your name to check for the previous reservation?

USER: Patricia Anderson here.

ASSISTANT: Please allow me a moment.

USER: Sure.

ASSISTANT: Patricia Anderson, there is no reservation found under your name.

USER: Ok, thank you.

ASSISTANT: Thank you for contacting us.