You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Carol Phillips here.

ASSISTANT: Carol, how can I render you today?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check in our data base.

USER: Ok, I will wait.

ASSISTANT: Sorry Carol, there are no flights reserved on your given name formerly.

USER: Anyway, thanks for the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.