You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: Please book a ticket from Dallas & Fort Worth, TX-DFW to Denver, CO-DEN. I am Barbara Hernandez.

ASSISTANT: Sure, can you please provide your travelling dates?

USER: Departure date is 01/25 and will return by 01/27.

ASSISTANT: Do you need any halt?

USER: Please provide a halt.

ASSISTANT: Unfortunately there is no flights found with your provided information.

USER: Thanks for the assistance.