You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Due to heavy snowfall, I would like to change my existing reservation. Please help me out.

ASSISTANT: Sure, may I know your name please to check the reservation status?

USER: My name is Cynthia Hernandez.

ASSISTANT: Cynthia, there is no reservation found with your details.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a great day.