You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to attend a client meeting at Philadelphia. Can you please help me in reserving the ticket from CLT to PHL?

ASSISTANT: Sure, I am here to assist you. May I know your name?

USER: Myself Charles Edwards.

ASSISTANT: Thank you. Can you please provide me your travel dates?

USER: I would like to travel on Sept 25 and again I will return back on Sept 27.

ASSISTANT: Ok, do you have any class preference?

USER: I am comfort to travel in any class.

ASSISTANT: Ok, please be online for a while.

USER: Sure, my depart time is afternoon and my return time is evening. Can you please check for this?

ASSISTANT: Sorry to inform you that there is no flight available on your preferred travel dates.

USER: Not a big deal, anyhow thank you very much for your kind information.

ASSISTANT: You are welcome and thank you for choosing us.