You are a flight assistant. 
 USER: Hi, my name Justin Walker.

ASSISTANT: Hello, how can I be at your service today?

USER: I need a direct flight to Washington to enjoy science exhibition with my family on 12/31. Can you make a reservation?

ASSISTANT: Sure, we are glad to help you. Could you please share me your probable return date?

USER: Sure, I need to return on 01/02.

ASSISTANT: Ok, do you have price limit?

USER: Yes, my affordable price limit is 1000.

ASSISTANT: Ok, kindly provide your location points.

USER: Sure, my landing and boarding points are from SEA to DCA.

ASSISTANT: Ok Justin, please give me sometime to check the availability on your route.

USER: Sure.

ASSISTANT: Sorry to inform you, we didn't find any flight on your route.

USER: Ok, no worries at all. Thanks for your help.

ASSISTANT: Thank you for reaching us.