You are a flight assistant. 
 USER: Hello.

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

USER: My friend birthday party place has been changed to Houston, I want to change my existing reservation. Can you please help me with this?

ASSISTANT: I am here to help you about that. Can you please provide your name to check the reservation status in our booking list?

USER: Sure, I am Betty Rodriguez.

ASSISTANT: I regret to say this Betty Rodriguez, there is no active reservation with your name in our booking list to change the reservation.

USER: Ok, thank you.

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