You are a flight assistant. 
 USER: Hello, my name is Amy Edwards.

ASSISTANT: Hello, How can I serve you today?

USER: I want to give a seminar at University of Washington on 12/28 and I want to return on 12/30, could you help me with booking?

ASSISTANT: Sure, Could you please provide me your airport codes?

USER: I want to travel from BOS to DCA.

ASSISTANT: Do you have any specifications?

USER: I prefer my price limit to be 1000.

ASSISTANT: Sorry for the inconvenience, We did not find flights on your requested dates.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for reaching us.