You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Jack Jones from Washington. I have to attend a business meeting in Chicago next week. Can you please book a flight ticket from DCA to ORD?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Thank you for your response, my departure date is 01/20 and please confirm my return ticket also on 01/22.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for approaching us.