You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Stephanie Carter.

ASSISTANT: Nice to meet you, Carter.

USER: Due to heavy snowfall in my area, I want to change my existing reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Carter, there is no reservation is found on your name to change your reservation.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for contacting us.