You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you help me to change the reservation which I had done recently?

ASSISTANT: Sure, may I know your name to change the reservation.

USER: Ok, please check for the name Karen Smith.

ASSISTANT: Please wait a moment.

USER: Ok, please take the time you need to amend the reservation.

ASSISTANT: Sorry there are no active reservations on your given name to change.

USER: Ok, that is not a problem. May be my brother had amend it for me. Anyways thank you for assisting me.

ASSISTANT: Thank you for reaching our service.