You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Ronald Lopez, can you help me to change my reservation which I recently did?

ASSISTANT: Sure, I am here to help you out.

USER: Ok, thank you.

ASSISTANT: There is no reservation on your name in our data base.

USER: Ok, name is Ronald Lopez for which the reservation is done.

ASSISTANT: Thank you for reaching us.