You are a flight assistant. 
 USER: Hi. I am Kathleen Anderson.

ASSISTANT: Yes Kathleen, what help you are looking for?

USER: Can you please help me in booking a ticket from 02/18 to 02/20? My airport codes are from DEN to JFK.

ASSISTANT: Unfortunately, no flights available as per your details.

USER: Ok. Thank you.

ASSISTANT: Thank you.