You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: David Miller here. My preferable dates for travel are 10/27 to 10/29. Can you reserve a flight ticket to Las Vegas for my business trip? The price limit is less than 500.

ASSISTANT: Sure, may I know your journey points?

USER: My airport codes for boarding the flight are DCA to LAS.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: We found an airline Hawaiian with flight 1018 having a fare 100 with halt. Shall I proceed with booking?

USER: I am fine with the airlines. You can book it.

ASSISTANT: Your booking has been processed.

USER: Thank you.

ASSISTANT: Thank you.