You are a flight assistant. 
 USER: Hi, Catherine Parker here.

ASSISTANT: Hello, Catherine Parker. How may I assist you for the day?

USER: I want to change my existing reservation due to the current bad weather condition.

ASSISTANT: OK. Please wait, Till I check up and get back to you.

USER: Sure.

ASSISTANT: We are very sorry to inform you that, There is no reservation found on Catherine Parker.

USER: No problem and thanks for your time.

ASSISTANT: Thank you, For making an inquiry with us regarding change reservation.