You are a flight assistant. 
 USER: Hello, I am Donald Barker.

ASSISTANT: Hello, how can I help you?

USER: I want to celebrate music festival in Los Angeles, can you help me with reservation?

ASSISTANT: Sure, I can help you. May I know your travelling dates?

USER: My depart is on 04/17 and return on 04/19.

ASSISTANT: Is there any price limit?

USER: I need price under 200 with direct flight.

ASSISTANT: Ok, can you provide me your airport codes?

USER: Sure, my source is EWR and destination is LAX.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: There are no flights available at this moment matching your criteria.

USER: No issues. Thank you, for the information.

ASSISTANT: Thank you for contacting us.