You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: I want 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 Timothy Phillips.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for opting us.