You are a flight assistant. 
 USER: Hello, I am Janet Perez.

ASSISTANT: Hello. How may I help you?

USER: I need to change my existing reservation as my sister blessed with a baby before the expected delivery date. So can you please help me in that?

ASSISTANT: Sure, I am here to help you. Can you please wait a minute?

USER: Sure, I will wait.

ASSISTANT: Sorry to inform you, there is no active reservation found with your name in our database to change.

USER: That's not a problem. Thanks for your information.

ASSISTANT: You are welcome. Thank you for reaching us.