You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Due to health issue, I want to cancel my reservation, can you please help me?

ASSISTANT: Sure, could you please mention your name?

USER: My name is Jack Roberts.

ASSISTANT: Sorry Roberts, there is no reservation found on your name.

USER: No issues, thank you for your service.

ASSISTANT: You are welcome.