You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ruth Hall.

ASSISTANT: Ruth Hall, how can I aid you today?

USER: I want to change my existing reservation due to board exams. Can you help me in this?

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: Ok.

ASSISTANT: Sorry Ruth Hall, there are no flights reserved on your given name formerly.

USER: That's ok, thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.