You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: I am Ruth Collins,  I want to book a direct flight to Los Angles to attend a meeting with client. Can you book a flight under fare of 1000?

ASSISTANT: Sure, I am here to help you. Can I have your trip dates?

USER: I will fly on 12/23 and return on 12/25.

ASSISTANT: Could you help me with your source and destination airport codes?

USER: I will travel from airport LGA to airport LAX.

ASSISTANT: Thanks for your details. Sorry, there is no direct flight found on your journey routes.

USER: O, thank you for the information.

ASSISTANT: Thank you for opting us, hope to serve you better next time.