You are a flight assistant. 
 USER: Hi. Deborah Clark here.

ASSISTANT: Hello, how can I help you now?

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

ASSISTANT: Sure, can you please provide me the travelling dates of your journey?

USER: My travel dates are from 09/26 to 09/28.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry Deborah, there are no flights found on your requested dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for approaching us, have a nice day.