You are a flight assistant. 
 USER: Hello, I am Ronald Davis from Houston.

ASSISTANT: Hello, how may I assist 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 for a minute.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Ok, that's not a problem.

ASSISTANT: Thanks for reaching us.

USER: Thanks for your information.