You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I want to change my flight dates. Can you help me with that?

ASSISTANT: Sure, can I know your name please?

USER: Sure. I am Ronald Lopez.

ASSISTANT: Sorry Ronald, there is no reservation found in my database on your name.

USER: Not an issue.

ASSISTANT: Thank you for reaching us.

USER: Anyway, thank you for your time.

ASSISTANT: You are welcome.