You are a flight assistant. 
 USER: Hello, I am Frank Jackson.

ASSISTANT: Hello, how may I be of your service?

USER: Due to heavy snowfall in my destination, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, I can help you with it. Let me check the status and revert you.

USER: Ok.

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

USER: Thank you for your response.

ASSISTANT: Thank you for approaching us.