You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Owing to emergency I need to change my reservation, can you please help me out?

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

USER: Ok, please check the reservation on the name of Larry Williams.

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

USER: Ok, no problem. Thank you.

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