You are a flight assistant. 
 USER: Hi, I am Barbara Scott.

ASSISTANT: Hello, how can I help you today?

USER: I want to travel to PHX  to celebrate my birthday with my family, can you help me with booking from DCA?

ASSISTANT: Sure, we are happy to help you. May I know your travel dates?

USER: My travelling dates are from 12/18 to 12/20.

ASSISTANT: Do you want any connection limit in between the journey?

USER: I need a direct flight.

ASSISTANT: Ok, please wait a moment I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say, no flight found with your requirement.

USER: Thanks for the response.

ASSISTANT: Thanks for opting us, have a great day.