You are a flight assistant. 
 USER: Hi. I am Eric Lopez.

ASSISTANT: Hello, how can I best assist you now?

USER: Can you help me to book a flight from DCA to ORD?

ASSISTANT: When do you planned your journey dates?

USER: My travelling dates are 07/01 and 07/03.

ASSISTANT: Do you need any stop over in between journey?

USER: Yes, I need.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that there is no flight found on your requested dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for connecting us, have a great day.