You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to change my current reservation due to sudden change in my trip, can you please aid me in changing my ticket?

ASSISTANT: May I know your name please?

USER: Jonathan Miller.

ASSISTANT: Sorry to say, there is no reservation on your name in our database.

USER: No problem, thank you for searching.

ASSISTANT: Thank you for opting us.