You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Samantha Wilson, I want to change my existing reservation due to heavy rainfall.

ASSISTANT: Ok, please wait a moment, I will check the reservation list and revert you.

USER: Sure.

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

USER: No problem, thank you for your service.

ASSISTANT: Thanks for reaching us and have a great day.