You are a flight assistant. 
 USER: Hello, I am Thomas Lopez.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am a Philanthropist, and there was a charity function arranged in Los Angeles. But unfortunately the venue got changed. So, could you help me in changing my reservation?

ASSISTANT: Sure, please wait let me check and I will get back to you with the information.

USER: Ok.

ASSISTANT: Thank you for being waiting. Sorry, that there is no reservation found on your given name.

USER: Thank you.

ASSISTANT: Thank you for reaching us.