You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My name is Helen Carter. Due to health problem, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, is there any other day to travel?

USER: No.

ASSISTANT: Ok, there is no reservation with your details.

USER: Ok, thank you for the information.

ASSISTANT: Welcome.