You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I would like to change my flight reservation as my father is unwell, could you please help me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you. The reservation was done in the name of Anthony Hall.

ASSISTANT: May I know your name for checking your previous reservation?

USER: My name is Anthony Hall.

ASSISTANT: There is no reservation found under your name to change.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for choosing us.