You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Sharon Green.

ASSISTANT: How can I support today?

USER: I have a meeting to attend at Washington. Can you help me in booking a ticket from PHL to DCA?

ASSISTANT: Ok, please tell me your planned dates of trip.

USER: I am planning to travel on 01/19 and return on 01/21.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Green, I did not find any flight for you as per your requirements.

USER: Its ok, thank you for the information.

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