You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Jacob Taylor here. Please help me out in changing my recent reservation.

ASSISTANT: Sure, I can help you. May I know your name?

USER: I mentioned above.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT:  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to change it.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.