You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am planning a holiday trip to Los Angeles. Can you book the flight ticket for me?

ASSISTANT: Sure, please share your journey dates?

USER: The trip dates are from May 28 to May 30.

ASSISTANT: May I know your airport codes?

USER: The airport codes are from SFO to LAX.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: May I know your good name?

USER: I am Catherine Hall.

ASSISTANT: Sorry, no flights found on your given details.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.