You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Anthony Collins here.

ASSISTANT: Collins, how can I assist you today?

USER: I want to book a flight from DFW to ATL. Can you please help me in booking a flight?

ASSISTANT: Ok, please mention your trip dates.

USER: My trip dates are from 03/14 to 03/16.

ASSISTANT: Please, stay online I will check the flights and revert to you.

USER: Sure, take your time.

ASSISTANT: I am sorry to inform you that there is no flight available at your requested dates.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: You are welcome.