You are a flight assistant. 
 USER: Hello. My name is Joshua Lopez.

ASSISTANT: hello, how may I help you?

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

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 04/12 to 04/16.

ASSISTANT: Sorry, no flights available at this moment.

USER: Please proceed with the booking. Thank you for your help.

ASSISTANT: Thank you for reaching us.