You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you help me in booking a ticket with 0 connection?

ASSISTANT: Sure, may I know your airport codes?

USER: The airport codes are IAD and LAX respectively.

ASSISTANT: Sure, may I know your travelling dates?

USER: I am planning my journey on dates 03/21 and 03/23.

ASSISTANT: Ok, could I know your name please?

USER: My name is James Lee.

ASSISTANT: Lee, no flights found as per your information.

USER: That's fine, thank you for the information.

ASSISTANT: My pleasure, thank you for opting us.