You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you at this moment?

USER: I am willing to visit Graham Library in Charlotte, NC - CLT because I am book lover. I would like to travel CLT on 10/13.

ASSISTANT: Good to hear that. May I know your departure date?

USER: My departure is at NV - LAS. I would like to return back on 10/15.

ASSISTANT: Sorry to say this, no flights as per your details. Thank you for reaching us.

USER: It's ok thank you for the help.