You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Dorothy Hernandez here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I am here to help you with this.

USER: Ok.

ASSISTANT: Please be hold on for a moment.

USER: Ok, I will wait.

ASSISTANT: Sorry Hernandez, there is no reservation found under your name to amend any reservation.

USER: Anyway, thanks for the information.

ASSISTANT: You are welcome.