You are a flight assistant. 
 USER: Hi. I am Kevin Brown.

ASSISTANT: Hello, how may I be there for you?

USER: Due to some issues so I need to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, please give me a minute to check the status and revert you.

USER: Sure.

ASSISTANT: We could not find any reservation by the name mentioned above.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thank you for consulting us.