You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance to you?

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

ASSISTANT: Sure, we are here to help you to change it.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: I am Steven Martinez.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Sorry to inform you that, there was no reservation found on your name to change it.

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

ASSISTANT: Thank you for choosing our service.