You are a flight assistant. 
 USER: Hello, I am Dorothy Martinez.

ASSISTANT: Hello, how may I be your helping hand?

USER: Owing an emergency want to change my existing reservation, can you please help out with this?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Sorry, we did not find any reservation in your name. Thanks for using our service.

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