You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you for this moment?

USER: Helen Jones here. I am a politician, I have to meet Donald Trump in Washington DC. So please book my ticket from DEN to DCA.

ASSISTANT: Sure, could you please provide me with your preferable dates of journey?

USER: My itinerary dates are 01/13 and 01/15.

ASSISTANT: Ok, please wait for a mean while to check for the availability of a ticket.

USER: Sure.

ASSISTANT: There is a flight with the connections limit 1 of fare 300 and the airline is naming as UA, are you ok with this ticket booking?

USER: Please book my ticket.

ASSISTANT: Your ticket has been reserved with the flight number 1010.

USER: Thank you for helping me.

ASSISTANT: You are welcome and hope you have a safe journey.