You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me in booking a flight tikcet to IAD from PHL?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My trip dates are from Sept 25 to Sept 27.

ASSISTANT: May I know your name to proceed further?

USER: I am Jason Miller.

ASSISTANT: Sorry, there is no flight to reserve a flight for you.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.