You are a flight assistant. 
 USER: Hello. I am Katherine Gonzalez.

ASSISTANT: Hello, how may I render you?

USER: I want to change my reservation due to sudden prepone of my baby birth.

ASSISTANT: Sure, let me check the data base and revert you.

USER: Okay.

ASSISTANT: We could not find any reservation by the name you gave.

USER: Ok. Thank you.

ASSISTANT: Thank you for approaching us.