You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Richard Miller.

ASSISTANT: How may I assist you today?

USER: Please cancel my reservation as my meeting was postponed.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Unfortunately there is no reservation found with your given name in our data.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.