You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Joseph King. I want to change my existing reservation due to postpone of my client meeting so, can you help me with changing my reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check the reservation on your name and revert to you.

USER: Sure.

ASSISTANT: Thank you for being patient, There was no reservation found on your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.