You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Sandra Campbell. I am planning to cancel my recent reservation, due to health issue. Can you please cancel my ticket?

ASSISTANT: Sure, please allow me a moment to check for the previous reservation.

USER: Sure.

ASSISTANT: Sandra Campbell, there is no reservation found under your name.

USER: That's fine, thank you for your service.

ASSISTANT: You are welcome. Thank you for contacting us.