You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Gary Hernandez here. I need to change my existing reservation as my sister blessed with a baby before the expected delivery date.

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for reaching us, have a nice day.