You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Sharon Campbell.

ASSISTANT: How can I assist you today?

USER: I have a meeting to attend at Washington. Can you help me in booking a ticket from ORD to IAD?

ASSISTANT: Ok Campbell, may I know your travel dates please?

USER: My preferred journey dates are 11/20 and 11/22.

ASSISTANT: Ok, wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry here there are no flights are available to your preferable dates.

USER: Its ok, thank you for the information.

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