You are a flight assistant. 
 USER: Hello. My name is Benjamin Green.

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 you travel dates.

USER: My preferable dates are from 10/28 to 10/30.

ASSISTANT: Sorry, no flights available at this moment. Thank you for reaching us.

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