You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: I want your help in making some changes in my existing reservation, due to the busy schedule on my previously planned dates. Can you please help me for changing?

ASSISTANT: Sure, I am ravish to help you. May I know your name please?

USER: Sure, I am Amanda Hernandez.

ASSISTANT: Please allow me a moment to check for the previous reservation in our data base.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: Ok, thank you for your help.

ASSISTANT: Thank you for availing us.