You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Jerry Hall. I am planning to visit Millennium Park at Chicago, could you please help me with booking a flight ticket?

ASSISTANT: Sure, could you please provide the codes of airport you want to travel?

USER: My source airport code is DCA and destination airport code is ORD.

ASSISTANT: Ok, please share your travelling dates to search for the flight?

USER: I would like to take off on 11/19 and return on 11/21.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights were available on your dates.

USER: That's ok, I will find an another alternate way to complete my trip.

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

USER: Anyways, thank you for the information.