You are a flight assistant. 
 USER: Hello, I am Stephen Mitchell.

ASSISTANT: Hello, how can I serve you today?

USER: I want to attend Fine Art and Theatre festivals at Detroit with the fare of 200. Can you please book my flight ticket with the single connection?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from 10/19 to 10/21.

ASSISTANT: Please mention your journey airport codes.

USER: I want to fly from DC - IAD to MI - DTW.

ASSISTANT: Thank you for providing your details. Please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Thank you for your time. We found no flight available matching with your specifications.

USER: It's alright, not a problem. Thank you for your response.

ASSISTANT: Thank you for picking us and have a good day.