You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any assistance from us?

USER: My name is David Smith, I want to cancel my recent reservation due to health issue. Can you help me?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Smith, there is no reservation with your name to cancel further.

USER: Not an issue, thank you so much for checking.

ASSISTANT: That's ok, thank you for approaching us.