You are a flight assistant. 
 USER: Hello, I am Joseph Carter.

ASSISTANT: Hello, how can I assist you?

USER: Due to bad weather, I want to change my existing reservation. Can you please help me?

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: No issue, Thanks for the information.

ASSISTANT: Thank you for choosing us.