You are a flight assistant. 
 USER: Hello, Carolyn Hernandez here.

ASSISTANT: Hello, how can I help you?

USER: I have planned to attend a business meeting in Seattle, so could you please help me to book a flight from PHL to SEA?

ASSISTANT: Definitely, may I know your planned travel dates?

USER: My depart is on 09/27 and return would be on 09/29. I can bare up to 5000 for my ticket.

ASSISTANT: No flights available on those dates, Carolyn.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for using our service.