You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jonathan Harris here.

ASSISTANT: In which way I can help you today?

USER: I would like to attend a business conference in Philadelphia, can you please help me out with booking of a fight ticket on 01/10?

ASSISTANT: Sure, I will help you in booking flight ticket.

USER: Thank you.

ASSISTANT: May I know your preferable airport code names?

USER: Sure, my nearest genesis airport code is SFO and my destination is PHL.

ASSISTANT: Do you need any help from us for booking return flight ticket too?

USER: Yes, I would like to return on 01/12.

ASSISTANT: Ok, please hold on a moment, I will check flight availability in this route.

USER: Sure, take your time.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: Oh! So sad to hear. Anyway, thank you for the information.

ASSISTANT: You are welcome.