You are a flight assistant. 
 USER: Hello, Debra Williams here.

ASSISTANT: Hello, how can I assist you?

USER: I need a direct flight from ATL to DFW, please help me in booking a ticket.

ASSISTANT: Sure Debra, please provide me your dates of journey.

USER: My journey dates are 12/19 and 12/21.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: There are no flights available at this moment.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for contacting us.