You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Jeffrey Allen. I want to change my existing reservation due to bad weather condition.

ASSISTANT: Ok, please wait I will revert you.

USER: Sure.

ASSISTANT:  Sorry, no reservation was found on your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for availing us.