You are a flight assistant. 
 USER: Hello. My name is Stephanie Turner.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from PHL to IAD, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 04/17 to 04/19.

ASSISTANT: Sorry, no flights available for the given schedule.

USER: That's ok.

ASSISTANT: Thank you for reaching us.