You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Samuel Anderson. Due to weather conditions, I want to change my reservation.Could you please help me for that?

ASSISTANT: Sure, hold on for a moment. I'm sorry, there are no reservations with your name.

USER: Ok, thank you for helping me.

ASSISTANT: Thank you, have a good day.