You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Joshua Perez, can you help me to search a flight from DFW to DCA?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can you please provide your preferable dates that you want to travel?

USER: My travelling dates are 10/16 and 10/18.

ASSISTANT: Ok, please wait a moment to check the flights.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights available with your requested dates of travelling.

USER: That is fine. Thank you for your help.

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