You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Myself Emily Roberts. I want to change my plan, could you please help me in changing my existing reservation.

ASSISTANT: Give me a moment, let me check your details.

USER: Ok.

ASSISTANT: Sorry, I didn't found any reservation basis on your details.

USER: Ok, thank you for helping me.

ASSISTANT: Thank you for reaching us.