You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, may I know your name?

USER: Kimberly Lee is my name.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: Ok, no problem. Thanks for your fast response.

ASSISTANT: Thanks for reaching us.