You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Alexander Perez.

ASSISTANT: How can I serve you today?

USER: Can you help me in booking my flight ticket from ATL to LAS?

ASSISTANT: Sure, let me know your travel dates please?

USER: My journey dates will be Nov 18th and Nov 20th.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a connecting flight.

ASSISTANT: Ok, is there any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Do you need any other specifications?

USER: Make sure that my depart and return time should be in the afternoon.

ASSISTANT: Thanks for your details, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flight services available on your given route.

USER: Its ok, thank you.

ASSISTANT: Thanks for reaching us, have a nice day.