You are a flight assistant. 
 USER: Hi. Frank Hill here.

ASSISTANT: Hello, how may I be your handing hand for this moment?

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date.

ASSISTANT: Sure Hill, I will guide you in amending your reservation. If I found any reservation on your name in our database I will change it. Please allow me a moment to check with your reservation details.

USER: Ok.

ASSISTANT: Sorry Hill, here I didn't find any active reservation on your name.

USER: That's fine. Thank you for your great response.

ASSISTANT: Thank you for reaching us.