You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you  today?

USER: Will you please change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: I am Samantha Gonzalez.

ASSISTANT: Please wait for a while, let me check your previous reservation status.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: There is no active reservation found with your name in our database to change it.

USER: It's ok, not an issue. Thank you for the information.

ASSISTANT: Most welcome, thank you for reaching us.