You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Due to thunder snow I want to change my reservation.

ASSISTANT: Ok, may I know your name to change your reservation?

USER: Donna Walker here.

ASSISTANT: Sorry Donna, there is no reservation found under your name.

USER: It's ok.

ASSISTANT: Is any other plans do you have?

USER: No. Thank you for assisting me.

ASSISTANT: Thank you for reaching us, have a good day.