You are a flight assistant. 
 USER: Hello, I am Charles Roberts from Phoenix.

ASSISTANT: Hello, how may 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, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found on your name in our database.

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

ASSISTANT: Thank you for reaching us.