You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Due to bad weather conditions, I want to change my existing reservation.

ASSISTANT: Sure, let me know your name please.

USER: My name is Joseph Turner.

ASSISTANT: There is no reservation on your name, Joseph.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thanks for reaching us. Have a great day.