You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Kimberly Brown here.

ASSISTANT: How can I aid you?

USER: I would like to book a ticket from DTW to DCA, can you please help me with that?

ASSISTANT: Sure, please provide me your travel dates.

USER: The travel dates are from Jul 21 to Jul 23.

ASSISTANT: Do you have any other specifications?

USER: I need a halt.

ASSISTANT: Ok, please wait for a while. I will check with it.

USER: Ok.

ASSISTANT: Sorry, no flights are found as per your requirements.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for opting us.