You are a flight assistant. 
 USER: Hi I am Shirley Turner.

ASSISTANT: Hello, Shirley Turner. How can I help you for today?

USER: As my plan to visit my grand mother's place got postponed could you please help me in booking my flight ticket.

ASSISTANT: May I know, Do you want to book a ticket or change a reservation?

USER: Could you please change my existing reservation please.

ASSISTANT: Sure. There is no ticket reservation found on Shirley Turner.

USER: OK no issue. Thanks for your service.

ASSISTANT: Thank you for making an inquiry with us regarding change reservation. Have a nice day.