You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: Brenda Hernandez here. I want change my existing reservation due to my father health condition. Can you help in this one.

ASSISTANT: Sure, I am here to help you out. Please allow me a moment.

USER: Sure.

ASSISTANT: Sorry Brenda Hernandez, there is no active reservation on your name in our database.

USER: No issues, thank you for the infomation.

ASSISTANT: Thank you for reaching us.