You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I support you?

USER: I want to change my existing reservation due to bad weather conditions. Can you aid me?

ASSISTANT: Sure, may i know your name to check the list and revert you?

USER: My name is Larry Anderson.

ASSISTANT: Ok, please give me a moment.

USER: Ok.

ASSISTANT: We could not find any reservation on your name.

USER: Thank you.

ASSISTANT: Thank you for choosing us.