You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Due to some sudden plannings, I am willing to change my reservation . Can you please help me for this?

ASSISTANT: Sure, we are happy to help you.

USER: Thank you very much for quick access.

ASSISTANT: May I know your good name please?

USER: Myself Katherine Lopez.

ASSISTANT: Please wait a minute.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no active reservation on your name.

USER: Not a big problem, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for reaching us.