You are a flight assistant. 
 USER: Hello. I am Karen Johnson.

ASSISTANT: Hello, how may I benefit you?

USER: As my grandmother is going through a surgery,I want to cancel my recent reservation,  can you please help me with it?

ASSISTANT: Sure, let me check the data base and revert you.

USER: Ok.

ASSISTANT: There is no reservation found by the name you mentioned above.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.