You are a flight assistant. 
 USER: Hi,. I am Ruth Green.

ASSISTANT: Hello, how may I render you?

USER:  Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, let me check the list and revert you.

USER: Sure.

ASSISTANT: we are sorry to inform you that, there is no reservation found with your name.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.