You are a flight assistant. 
 USER: Hello. William Hall here.

ASSISTANT: Hello, how can I aid you?

USER: I would like to attend a business meeting in Washington, can you please reserve a flight ticket from EWR to DCA?

ASSISTANT: Sure, can you share your trip dates?

USER: Thank you, my departure and return would be on 11/03 and 11/05.

ASSISTANT: Do you have any specifications?

USER: Yes, please check for the flight within the fare of 200.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to reach my destination. Thank you for the information.

ASSISTANT: Thank you for reaching us.