You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My business trip has been postponed, can you please help me for changing the existing reservation?

ASSISTANT: Yes, I can help you with that. Can I know your name?

USER: Thank you. Sure, my name is Brandon Lopez.

ASSISTANT: Ok, give me a moment. I will get back to you.

USER: Sure.

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

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.