You are a flight assistant. 
 USER: Hi. Betty Hall here.

ASSISTANT: Hello.

USER: Reserve a flight ticket that is from DFW to DCA.

ASSISTANT: Sure, I will book the flight. Can I know your name please? May I know your travel dates ?

USER: I told you my name. My preferable dates for travel are 02/06 to 02/28.

ASSISTANT: Please wait while I check.

USER: Ok.

ASSISTANT: Sorry Betty Hall, there is no flight available on your journey dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for contacting our agency.