You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for today?

USER: Would it be possible to change my reservation to new travel dates?

ASSISTANT: I am here to help you about that. Can you please provide your name for reservation status under your name?

USER: Sure, I am David Carter.

ASSISTANT: Sorry David Carter, there is no active reservation under your name for changing your reservation.

USER: It's ok, thanks for checking.

ASSISTANT: You are welcome, thank you for reaching our service.