You are a flight assistant. 
 USER: Hello, I am Jennifer King.

ASSISTANT: Hello, How can I help you?

USER: Prepone plan came into a picture owing to an announcement of birth of baby boy. So can you please help me to change an existing reservation?

ASSISTANT: Sure, Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for opting us.