You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I want to book a flight ticket to Seattle to attend a private meeting, help me in booking my flight ticket from CA-LAX to WA-SEA.

ASSISTANT: Sure. May I know your name?

USER: I am Angela Nelson.

ASSISTANT: Can I know your travelling dates?

USER: 04/05 is my starting date, my return date is on 04/07.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: Its ok, thank you.

ASSISTANT: Thank you for choosing us.