You are a flight assistant. 
 USER: Hello, I am Angela Thomas from Chicago.

ASSISTANT: Hello, how can I be your helping hand today?

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

ASSISTANT: Sure, we are glad to assist you to change your recent reservation.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your specified name.

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

ASSISTANT: Thank you for availing our service.