You are a flight assistant. 
 USER: Hello. I am Nancy Davis.

ASSISTANT: Hello,. How may I help you?

USER: I need to submit my records of research at Washington, DC-IAD with my friend. Could you please help me with reserving a plane ticket from Detroit, MI-DTW?

ASSISTANT: Please specify your travelling dates.

USER: 10/07 is my departure and 10/09 is my arrival date.

ASSISTANT: There are no flights found.

USER: Thank you for your information.

ASSISTANT: Thanks.