You are a flight assistant. 
 USER: Hello, I am Donna Allen.

ASSISTANT: Hello, how can I support you today?

USER: Please make me a plane reservation with in price 200.

ASSISTANT: Sure, please provide me your source and destination codes.

USER: I need to reach Detroit, MI - DTW to attend an conference over there and I am starting from Houston, TX - HOU.

ASSISTANT: May I know your planned travel dates?

USER: I would start on 07/27 and return on 07/29.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: That's Ok.

ASSISTANT: Thank you for connecting with us.

USER: Thanks for the information.