You are a flight assistant. 
 USER: Hello, I am Jeffrey Parker.

ASSISTANT: Hello, how can I assist you at this moment?

USER: Please, reserve me a flight ticket from PHL to SFO.

ASSISTANT: Sure, I will help you with this. Can you please provide your journey dates?

USER: I am travelling from Aug 17 to Aug 19.

ASSISTANT: Do you need any halt in this journey?

USER: Yes, I need  a halt in between my journey.

ASSISTANT: Which class do you prefer to travel for this trip?

USER: I prefer economy class.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Jeffrey Parker, we regret to inform you that there are no flight services available on this route on your provided dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.