You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: I need to change my current reservation due to urgent meeting, can you help me with that?

ASSISTANT: Sure, I am here to help you with this. May I know your name please?

USER: Thank you. I am Benjamin Green.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry Green, there is no reservation found as per your name to change it.

USER: That's ok. Thank you for your service.

ASSISTANT: You are welcome.