You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Sandra Davis.

ASSISTANT: What can I do for you?

USER: I am planning to cancel my recent reservation, due to health issue.

ASSISTANT: Ok, please wait.

USER: Can you please cancel my ticket?

ASSISTANT: Sorry, no reservation found on your name to cancel.

USER: Sure. That's fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.