You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Yes, I can help you with that. Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: Not an issue, thank you.

ASSISTANT: Thank you for contacting us.