You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

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

ASSISTANT: Sure, May I know your name?

USER: Thank you. I am Mary Moore.

ASSISTANT: Please wait a second.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

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

ASSISTANT: Thank you for availing us.