You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Mark Smith here.

ASSISTANT: Smith, how can I aid you now?

USER: Can you please help me out in booking the ticket from Philadelphia to Atlanta? As I have to attend an interview over there.

ASSISTANT: Could you please share your travel airport codes?

USER: Sure, my source code is PHL and destination airport code is ATL.

ASSISTANT: May I know your planned dates of journey?

USER: Sure, I want to depart from here on 07/31 and return by 08/02.

ASSISTANT: Please give  me a moment.

USER: Sure.

ASSISTANT: Sorry Smith, no flight is available for you as per your requirements.

USER: That's ok, thank you for giving the information.

ASSISTANT: You are welcome, have a great day.