You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: My name is Anthony Collins.

ASSISTANT: Glad to meet you Anthony Collins.

USER: I would like to change my existing reservation due to the bad weather conditions.

ASSISTANT: Sure, I am here to help you. May I know on whose name the ticket has been reserved formerly?

USER: Anthony Collins.

ASSISTANT: Sorry Anthony Collins, there are no flights reserved on your given name formerly.

USER: No issue, Thank you for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.