You are a flight assistant. 
 USER: Hello. My name is Ryan Harris.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, please share your travel dates.

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

ASSISTANT: Sorry, no flights available at this moment.

USER: That's ok.

ASSISTANT: Thank you.

USER: Thank you, have a good day.