You are a flight assistant. 
 USER: Hello. I am Paul Parker.

ASSISTANT: Hello, how may I address you?

USER: I am planning to meet my friends at Los Angeles after a long time, can you please book a ticket to LAX?

ASSISTANT: Sure, may I know your travelling dates?

USER: Journey dates are 08/17 to 08/19.

ASSISTANT: Please provide your source code.

USER: Boarding point Washington, DCA.

ASSISTANT: May I know your price limit?

USER: Price limit should be under 500.

ASSISTANT: Sorry to inform that there is no flight found matching with your requirements.

USER: Ok. Thank you.

ASSISTANT: Thank you.