You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Sure, I am here to help you. May I know on whose name the ticket has been reserved formerly?

USER: Thank you. Please check the reservation on the name of Samantha Gonzalez.

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

USER: Ok, not a problem. Thank you.

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