You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Jones.

ASSISTANT: How may I assist you today?

USER: I would like to book a ticket from PHL to SEA, can you please help me out?

ASSISTANT: Sure, our agency can help you in booking process and I need your preferable travel dates. Can you please provide it?

USER: I am travelling on these dates 03/19 and 03/21.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling.

USER: Ok no problem, thank you for your services.

ASSISTANT: Welcome.