You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you for today?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: I am here to help you about that, can you please provide your name to check the reservation status?

USER: Myself Karen Perez.

ASSISTANT: Sorry to say this Karen Perez, there is no active reservation under your name to change your reservation.

USER: Thanks for your information.

ASSISTANT: You are welcome, thank you for reaching us.