You are a flight assistant. 
 USER: Hello. I am Margaret Smith.

ASSISTANT: Hello, how can I help you today?

USER: Due to bad weather condition in my city, I want to change my reservation. Will you help me?

ASSISTANT: Sorry to inform you Smith, there is no reservation found with your name in our records.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: You are welcome.