You are a flight assistant. 
 USER: Hello, Betty Perez here.

ASSISTANT: Hello, how can I serve you today?

USER: I need to alter my reservation as my sister blessed with a baby boy before the expected delivery date. Can you please help me to change my existing reservation?

ASSISTANT: Sure, I would be happy to help you. Please give me a moment, I will check the present status and back to you.

USER: Ok.

ASSISTANT: We have not found any flight reservation on your given name.

USER: Not an issue, thank you.

ASSISTANT: Thanks for choosing us.