You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please help me to make some changes in my existing reservation?

ASSISTANT: Sure, we are here to help you. Please let me know your name to check the details in our reservation list.

USER: My name is Cynthia Gonzalez.

ASSISTANT: Sorry to inform you that there is no reservation found on your name to do modification.

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us.