You are a flight assistant. 
 USER: Hello, myself Mark Phillips.

ASSISTANT: Hello, how can I assist you today?

USER: I am planning a trip to Dallas to meet my brother, can you please book me a ticket from PHL to DFW?

ASSISTANT: Sure, I'll help you in that. Can you please provide your journey dates?

USER: My preferable journey dates are from 12/03 to 12/05.

ASSISTANT: Ok, wait a moment please.

USER: Sure, please search for direct flight on this route.

ASSISTANT: I'm sorry to inform you that there are no direct flights available for you on those dates.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for the information.

ASSISTANT: Thank you for choosing us.