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

ASSISTANT: Hello, how may I help you today?

USER: My business meeting venue got changed to client place, can you help me in changing the reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there was no reservation found with your name.

USER: Ok, no problem. Thank you for your quick response.

ASSISTANT: Thank you for choosing us.