You are a flight assistant. 
 USER: Good Morning, Sarah Carter here.

ASSISTANT: Hello Carter, how can I help you?

USER: I want to change an existing reservation, due to sudden change in my plan.

ASSISTANT: Sure, I will check and let you know. There is no reservation on your name, Carter.

USER: Oh! that's ok, thanks for the information.

ASSISTANT: Thanks for contacting us.

USER: Thank you for the support.