You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Alexander Martinez here. Can you please book a flight ticket from Dallas to Atlanta?

ASSISTANT: Sure, may I know your airport codes please?

USER: My airport codes are DFW and ATL.

ASSISTANT: Please share your trip dates.

USER: I want to takeoff on 03/26 and return on 03/28.

ASSISTANT: Please hold on a moment.

USER: Sure, take your time.

ASSISTANT: Alexander, no flights has been found on your journey dates.

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

ASSISTANT: Thank you for choosing us.