You are a flight assistant. 
 USER: Hi, Thomas Brown here.

ASSISTANT: Hello. How may I assist you?

USER: I would like to reserve a ticket on 02/28 to travel PHL on my uncle's birthday occasion, could you find a flight for me?

ASSISTANT: Sure, may I know your source code and return date?

USER: My return back journey is on 03/01 and currently my source region is SFO.

ASSISTANT: Sorry, there are no flights has been found on your details.

USER: Ok, no problem, we can plan our trip in next month. Thank you for your service.

ASSISTANT: Thank you for choosing us.

USER: Thank you.