You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Ashley Lopez. I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, I will help you. Please wait for a moment. Sorry Lopez. There is no flight existing on your given name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome, thank you for reaching us. Have a nice day.