You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I have got an invitation to participate in photography contest in Washington DC - DCA. So can you please book a ticket from Los Angeles, CA - LAX?

ASSISTANT: Sure, please provide me your days of travelling?

USER: My dates of travel are from 07/31 to 08/02.

ASSISTANT: Ok, please wait I will revert you.

USER: OK.

ASSISTANT: We are glad to inform you that there is a flight matching your requirement.

USER: Flight details please?

ASSISTANT: Airline: AA, flight number:1002. Price is 200 with a single connection.

USER: OK, please confirm booking.

ASSISTANT: To proceed further can I know your name please?

USER: I am Helen Smith.

ASSISTANT: Your booking is confirmed.

USER: Thank you for your kind reply and positive response.

ASSISTANT: Thank you  for choosing us.