You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Gregory Miller, I want to book a flight on 10/14 and return on 10/16 to attend a meeting. Can you book a flight under fare of 200?

ASSISTANT: Sure, may I know your airport codes?

USER: I will fly from DC-IAD to CA-LAX.

ASSISTANT: There is no flight on your details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you so much.