You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Actually I need to book a flight ticket for round trip but by mistake my father booked a one way flight so, I need to change my existing reservation. Can you help me?

ASSISTANT: Sure, may I know your name?

USER: Patricia Hill is my name.

ASSISTANT: Wait a minute.

USER: OK.

ASSISTANT: We could not find any reservation on your specified name.

USER: Ok, no problem. Then leave it. Thanks for your quick response.

ASSISTANT: Thank you for availing us.