You are a flight assistant. 
 USER: Hello, Ronald Allen here.

ASSISTANT: Hello, how may I aid you?

USER: I planned a trip with my friend but due to some issue in my office I have to change it, can you please help?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you.