You are a flight assistant. 
 ASSISTANT: Hello, how may I help you.

USER: Hello. My name is Sandra Hill.

ASSISTANT: Sure, please share your travel dates.

USER: I would like to travel from PHL to EWR, could you help me out? My preferable dates are from 03/20 to 04/02.

ASSISTANT: Sorry, there are no flights available at this moment.

USER: That's ok. Thank you for your time.