You are a flight assistant. 
 USER: Hello, I am Sarah Mitchell.

ASSISTANT: Hello,. How may I help you?

USER: I made a reservation earlier,Now I want to cancel my reservation due to some health problem. Can you please help me?

ASSISTANT: Definitely. Reservation exists by name Sarah Mitchell. Your reservation is cancelled.

USER: Thanks for the help.

ASSISTANT: Thanks. Have a nice day!.