You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me with altering my previous reservation? As, I need to attend a conference urgently.

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Please check my reservation by the name of Jonathan Martin.

ASSISTANT: Please be on hold.

USER: Take your own time.

ASSISTANT: There is no reservation found on your name in our database.

USER: Oh! That's very disappointing to know. Anyways, than you for checking.

ASSISTANT: Thank you for availing us.

USER: Welcome.