You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am Patricia Jones, I want to change my existing reservation due to postpone of my client meeting.

ASSISTANT: Sure Jones, I glad to solve your concern. Please allow me a moment to check whether any active reservation found on your name or not.

USER: Sure.

ASSISTANT: Sorry Jones, there is no reservation found on your name in our reservation portal.

USER: No problem, thank you.

ASSISTANT: Thank you for contacting, come back to us with any kind of concern,.