You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Karen Hernandez.

ASSISTANT: How can I assist you now?

USER: Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry Karen Hernandez, no reservation has found under your name to change.

USER: That's ok, thank you for the response.

ASSISTANT: Thank you for choosing us, have a good day.