You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Sandra Parker here. I need to attend a meeting at Washington, can you please help me in booking a flight ticket from ORD to IAD?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, my travel dates are from 06/22 to 06/24.

ASSISTANT: Please wait for a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry to say, no flight is available for you.

USER: Ok, no problem. I will check with other agency. Thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.