You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Rachel Thompson here.

ASSISTANT: How may I help you today?

USER: I want to attend a Seminar in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you with that. Can I know your travelling dates?

USER: My travelling dates are from 10/09 to 10/11.

ASSISTANT: Ok, please wait for a minute. May I know your airport codes?

USER: My airport codes are from DTW to DCA. Make sure my connections limit is 0.

ASSISTANT: Ok, wait for a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.