You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Gregory Miller. I am looking for a flight from ORD to IAD, can you help me in booking the flight ticket from Chicago?

ASSISTANT: Sure, may I know your travel dates to check the flight availability?

USER: Sure, my planned travel dates are Apr 26 and Apr 28.

ASSISTANT: At what time do you like to leave from ORD?

USER: I didn't planned for any preferred timings but make sure to book a flight which consists of a connecting flight for a normal airline cost.

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

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, there is no flight on your route.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.