You are a flight assistant. 
 USER: Hello, my name is Joshua Rodriguez.

ASSISTANT: Hello, how may I aid you for today Rodriguez?

USER: Can you please assisting me in booking a flight ticket from PHL to DEN to attend a customs meeting?

ASSISTANT: Sure, I am here to help you. Can you please help me with your preferable dates of journey?

USER: I have to reach that place on 02/11 and return back on 02/13.

ASSISTANT: Sorry Rodriguez, I have not find any flights which can travel your destination on your preferable dates of journey.

USER: Ok, no problem I can reach other travelling agencies, thank you for help.

ASSISTANT: My pleasure, thank you for opting us.