You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I have to attend the protest near White House at Washington, can you please book me a ticket?

ASSISTANT: Sure, I will help you. Can you please help me with the airport codes for easy search?

USER: Sure, my origin airport code is IAD and my destination airport code is DCA.

ASSISTANT: Can I have your full name for further process?

USER: My name is Brian Roberts.

ASSISTANT: Ok, that's a nice name Brian Roberts. In which dates you are willing to travel?

USER: My preferable journey dates are from 05/13 to 05/15.

ASSISTANT: Ok, can you please be on hold for a minute, while I am checking the flights?

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting. Sorry to inform you that, there are no flights available in the dates you have provided to me.

USER: Ok, no issues. I will find any alternate for this trip.

ASSISTANT: Thank you for your positive response. Have a nice day.

USER: Thank you for providing information.