You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I provide assistance to you?

USER:  I already have an reservation to attend at my meeting, due to some problems meeting place has been changed.

ASSISTANT: Ok.

USER: So, I need to cancel the  reservation with the name of Thomas Johnson.

ASSISTANT: Sure. Please wait a minute.

USER: Ok.

ASSISTANT: Thanks for waiting.

USER: Fine.

ASSISTANT: Thanks for waiting. There is no reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.