You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I want to do some changes in my existing reservation as I provided wrong details. Can you help me in changing my existing reservation?

ASSISTANT: Sure, help me by providing your existing reservation name.

USER: My name is Carolyn Garcia.

ASSISTANT: Sorry, no reservation found with your name to change.

USER: That's fine. Thank you for your information.

ASSISTANT: Thank you for contacting us.