You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, May I know your good name please?

USER: My name is Donna Nelson.

ASSISTANT: How can I assist you?

USER: I need a flight ticket with a direct flight. Can you book a flight ticket under the range of 200?

ASSISTANT: Ok, Kindly mention your travelling dates?

USER: My dates are 07/28 and 07/30.

ASSISTANT: Can you please provide me your airport abbreviates?

USER: I would like to visit Historic Fort Watne at DTW from IAD.

ASSISTANT: Ok, wait for a minute, I will revert you with the availability.

USER: Sure.

ASSISTANT: We are very sorry to notify you that there is no flight found based on your details.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you for choosing us, Have a wonderful day.