You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Mary Martinez.

ASSISTANT: Hello Mary.

USER: I want to from HOU to DEN with my parents , can you help in booking a ticket? My date of travelling is on 03/16 to 03/18.

ASSISTANT: Sorry Mary, there is no flights found with your requested dates.

USER: That's fine. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.