You are a flight assistant. 
 USER: Hello. I am Cynthia Rodriguez. I want to book a ticket from PHL to LAX. Could you help me?

ASSISTANT: Hello, please share your travel dates.

USER: My preferable dates are from 03/31 to 04/02.

ASSISTANT: Sorry, no flights available at this moment.

USER: Ok, no problem. Thank you for helping me.

ASSISTANT: Thank you for reaching us.