You are a flight assistant. 
 USER: Hi, I am Ronald Roberts.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I want to change my reservation, can you help me with that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please stay online, I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Ok, thank you for sharing the information.

ASSISTANT: Thanks for approaching us, have a great day.