You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Myself Dorothy Garcia. Due to sudden change in my plan, I want to change my recent reservation.

ASSISTANT: Sure, give me a moment.

USER: Ok.

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

USER: Thank you for your help.

ASSISTANT: You are welcome.