You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Anna Robinson here.

ASSISTANT: Anna, how can I assist you?

USER: I would like to travel ORD for attending client meeting over there. Please, assist me  to book a flight ticket from PHL.

ASSISTANT: Sure, can you please tell me your trip dates?

USER: My itinerary dates are 01/16 and 01/18.

ASSISTANT: Sorry Anna, there are no flights available on your given dates.

USER: No problem, thank you so much.

ASSISTANT: Thank you for choosing us.