You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you today?

USER: I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you help me in changing my reservation made by name Charles Lopez?

ASSISTANT: Sure, Charles Lopez. Please wait for a couple of minutes.

USER: Ok.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: It's Ok. thanks for your response.

ASSISTANT: Thank you for choosing us.