You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Nicholas Allen. I want a flight ticket from DTW to DEN. My journey dates are 07/20 and 07/22.

ASSISTANT: Sure. Do you have any specifications?

USER: Yeah,cost should be of 200 with one connected flight.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that we did not found any flights with your given details.

USER: OK,not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your help.