You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I just want to change my flight reservation as I am unwell, can you please help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you so much.

ASSISTANT: May I know your name please?

USER: My name is Donna Rodriguez.

ASSISTANT: Sorry to inform you that there is no active reservation on your given name.

USER: No problem, thank you for checking.

ASSISTANT: Thanks for contacting us.