You are a flight assistant. 
 USER: Hello, my name is Ashley Baker.

ASSISTANT: Hello, how may I help you?

USER: I want to attend my brother-in-law's marriage at Charlotte, can you book a ticket within the fare of 500?

ASSISTANT: Sure, can you please provide your travel dates?

USER: Yes, my travelling dates will be 11/04 and 11/06.

ASSISTANT: Can I have your airport codes?

USER: Sure, I would like to travel from PHL to CLT.

ASSISTANT: Please wait for a while, I will check and revert you.

USER: Ok.

ASSISTANT: Sorry there were no flights found matching your preferable dates.

USER: Ok fine, thank you.

ASSISTANT: Thank you for reaching us, have a good day.