You are a flight assistant. 
 USER: Hello, I am Richard Miller.

ASSISTANT: Hello, how can I aid you?

USER: Due to some technical issues my client meeting has been postponed so, I want to change my reservation.

ASSISTANT: Sure. Please wait a moment I will check and let you know.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for reaching us.