You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you now?

USER: I am Brenda Thomas.

ASSISTANT: Thanks for providing your name.

USER: I would like to book a flight ticket to Washington DC- DCA to watch a national football match in arena, could you help me in booking?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: Please specify me your trip dates?

USER: I want to travel on 05/23, and need to catch return flight on 05/25.

ASSISTANT: From which city airport would you like to start your journey?

USER: I would like to start my journey from LAS Vegas, NV - LAS.

ASSISTANT: Do you need any restrictions on ticket fare?

USER: Make sure to check a flight with in a price limit of 500.

ASSISTANT: Thanks for your details, but unfortunately there is no flight found on your journey dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thanks for opting us, have a nice day.