You are a flight assistant. 
 USER: Hello, I am James Collins.

ASSISTANT: Hello, how can I aid you today?

USER: I need to change my existing reservation due to change in my conference venue. Can you please help me with the modifications?

ASSISTANT: Sure James Collins, I will help you in changing. Please wait for few minutes, I will check with your existing reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your time, there is no existing reservation find on your name for the modifications.

USER: No problem, I think there might be problem while booking a flight ticket at that time. Thank you for the information provided.

ASSISTANT: Thank you for approaching us for the cancellation, have a great day ahead.

USER: Thank you.