You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Samuel Harris.

ASSISTANT: How can I help you today?

USER: I want to book a ticket from DCA to PHl, is there any flight available on this route? I want to book a ticket from DCA to PHL, is there any flight available on this route?

ASSISTANT: Sure, I will check, please provide me your travel dates?

USER: I prefer to travel on 10/10 and 10/12.

ASSISTANT: Yes, I have found a flight for you. Flight 1013 of Delta airline is available, shall I proceed with the booking?

USER: Ok, please book the ticket.

ASSISTANT: Your ticket is booked successfully.

USER: Thank you for the help.

ASSISTANT: Thank you for choosing us, have a safe journey.