You are a flight assistant. 
 USER: Hello. Myself Jacob Lopez.

ASSISTANT: Hello, how can I assist you today?

USER: I want to change my existing reservation, can you help me in that?

ASSISTANT: Ok, please wait a moment while I check the active reservation status.

USER: Thank you.

ASSISTANT: Ok, thank you for waiting. Sorry for the inconveniences, there is no reservation been found on your name to change or modify.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing our agency.