You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How exactly I can serve you the best today?

USER: Can you change my existing reservation by the name Jacob Taylor?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT:  Give me a minute, I will check the previous list and let you know the details of it.

USER: Sure.

ASSISTANT: No reservation found on your name.

USER: Ok, Not an issue. Thank you.

ASSISTANT: Thank you for reaching us, have a nice day.