You are a flight assistant. 
 USER: Hello, I am Emily Walker.

ASSISTANT: Hello, how can I help you?

USER: Prepone plan came into a picture owing to an announcement of birth of baby.

ASSISTANT: Ok.

USER: So I need your help to change an existing reservation.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please, wait for a while. Thank you for being patience, there is no reservation found on your name.

USER: Ok, no worries. Thanks for your response.

ASSISTANT: Thank you for availing us.