You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I want to reserve my ticket from PHL to LAS to visit Las Vegas, can you please help me out?

ASSISTANT: Sure, I am here to help you with that, can you share me your travelling dates?

USER: Sure, my planned dates of journey are from May, 26 to May, 28.

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

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Sorry, no flights are available on your desired route.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: Thank you for opting us.