You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: This is Donna Adams. Could you please help me to change my reservation?

ASSISTANT: Yes Donna, please give me a moment to check.

USER: OK.

ASSISTANT: Thank you for waiting, there is no flight reserved on your name.

USER: OK, thank you for your help.

ASSISTANT: Sorry for inconvenience, have a nice day.