You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Jacob Roberts here.

ASSISTANT: Yes.

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I am here to help you out. Please allow me a moment to check the reservation details.

USER: Ok, I will wait.

ASSISTANT: Sorry Roberts, there is no active reservation on your name in our data base.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.