You are a flight assistant. 
 USER: Hi, I am Eric Harris.

ASSISTANT: Hello, How may I assist you?

USER: I need to book a flight ticket under price 200. Can you help me in finding?

ASSISTANT: I will help you, Can you share me your journey points?

USER: I want to head to Charlotte, NC - CLT from Washington DC - IAD.

ASSISTANT: Please provide me your travel dates.

USER: My departure is on 02/20 and arrival is on 02/22.

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

USER: Ok, no problem. Thanks for your response.

ASSISTANT: Thank you, have a great day.