You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, may I know your good name please?

USER: I am Elizabeth Jones.

ASSISTANT: Thank you, how may I help you Elizabeth Jones?

USER: I want to book a flight ticket to Chicago on 06/21 to take a part in scuba driving, can you please help me with this?

ASSISTANT: Sure, I can help you better. May I know from where you want to book a flight ticket?

USER: I need to book a flight ticket from Washington DC-DCA to reach Chicago, IL-ORD.

ASSISTANT: Ok, may I know your return date to search for a perfect flight?

USER: I intend to return on 06/23.

ASSISTANT: Ok, do your require any more comforts in your journey?

USER: I need a break in between my journey.

ASSISTANT: Ok, please wait a minute. I will get back with available flights.

USER: Sure.

ASSISTANT: Sorry. We hardly tried to provide a best flight for you but, no flights are available to your locations.

USER: Ok, no issue. Thank you.

ASSISTANT: Thanks for contacting us, hope to serve you better next time.