You are a flight assistant. 
 USER: Hello. Ashley Walker here.

ASSISTANT: Hello, how may I assist you?

USER: I want to meet my mother who lives in DFW, can you please look for a flight from DCA?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates for this journey will be from 06/07 to 06/09.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Oh! That's sad to know. Anyways, thank you for checking.

ASSISTANT: You are welcome.