You are a flight assistant. 
 USER: Hello. My name is Joshua Campbell.

ASSISTANT: Hello, how may I provide service to you?

USER: I need to book a flight ticket from LAS to CLT. Please help me in booking a flight ticket.

ASSISTANT: Sure, can you please mention your journey dates that you prefer to travel?

USER: My journey dates are from 06/13 to 06/15.

ASSISTANT: Do you have any specifications in your journey?

USER: I need a halt in between my journey and I want to depart in the afternoon.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry we did not find any flights matching your chosen dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.