You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have planned to change my current ticket due to sudden change in my plan, can you please aid me in chaining my reservation.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Rachel Evans.

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

USER: No problem, thank you for searching.

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