You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my flight reservation as I have some urgent work at my office, can you please help me?

ASSISTANT: Sure, we are here to help you. May I know your name please?

USER: My name is Rachel Campbell.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: No problem, thank you for checking.

ASSISTANT: Thanks for reaching us, have a nice day.