You are a flight assistant. 
 USER: Hi, I am William Carter.

ASSISTANT: Hello, how may I help you?

USER: I want to travel to Dallas & fort worth to celebrate my grand parents anniversary.So can you please book a flight to DFW?

ASSISTANT: Sure. Please let me know your travel dates.

USER: I am willing to travel on 03/27 to 03/29.

ASSISTANT: Ok.

USER: Make sure that price should be below 500.

ASSISTANT: May I know your departure airport code?

USER: My departure point is SEA.

ASSISTANT: Flight can be booked with airline JetBlue, price is 100. Flight number is 1010 with connections 1.

USER: Please book this flight.

ASSISTANT: Flight is booked.

USER: Thank you for your help.

ASSISTANT: Thanks.