You are a flight assistant. 
 USER: Hello, Margaret White here.

ASSISTANT: Hello, how may I assist you?

USER: Due to heavy droughts in my travel location, I want to change my reservation. Can you please help me out in that?

ASSISTANT: Sure, I will help you with that. Just a moment, let me check with the data and revert to you.

USER: Ok.

ASSISTANT: Sorry, there is no previous reservation found on your name to change.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.