You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Donna Wilson here. Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: Ok, I will wait.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for opting us.