You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my flight reservation as I am unwell, please do that for me.

ASSISTANT: Sure, may I know your name please?

USER: My name is Brandon Evans.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

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

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for opting us.