You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please allow me a moment.

USER: Ok.

ASSISTANT: Turner, there is no reservation with your name to change further.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us, have a great day.

USER: Most welcome.