You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: As my exam is preponed, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure. Can I know your name?

USER: Myself Janet Wright.

ASSISTANT: We didn't found any reservation by this name.

USER: No issue, thank you for your time.

ASSISTANT: Thank you for opting us.