You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Justin Martin.

ASSISTANT: Martin, how can I aid you today?

USER: Due to some franchise meeting, I am going to change my existing reservation. Can you please help me for this?

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

USER: Sure, I will wait for your kind response.

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

USER: Not a big problem, anyhow thank you very much for your kind service.

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