You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Gary Allen.

ASSISTANT: I am here to assist you, can I know your concern?

USER: I looking for a flight from IAD to ATL, can you help me out in booking flight ticket?

ASSISTANT: Ok, I will assist you with that. Please can I know your travel dates?

USER: I planned my journey on 05/25 and 05/27.

ASSISTANT: Sorry there are no flight at your location.

USER: That's ok no problem. Thank you for your help.

ASSISTANT: Sorry for the inconveniences. Thank you for choosing our agency.