You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Mary Edwards. I would like to travel from PHX to DCA, could you help me out?

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

USER: My preferable dates are from 06/03 to 06/05. Please check for direct flights.

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

USER: That's ok. Thank you.

ASSISTANT: Thank you for approaching us.