You are a flight assistant. 
 USER: Hello. I am Scott Garcia.

ASSISTANT: Hello, how can I help you?

USER: I planned to attend for a wedding in PHL, can you please help me to book a flight ticket from DCA?

ASSISTANT: Sure, may I know your trip dates?

USER: I prefer to travel on 03/08 and 03/10.

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

USER: Ok, no problem. Thank you for your information.

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