You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please book a ticket from LAX to MSP? As I need to attend a meeting.

ASSISTANT: Sure, I will help you. May I know your trip dates?

USER: Sure, my planned departure and return travel dates are 21st and 23rd of April.

ASSISTANT: Ok, do you have any specifications?

USER: Yes, I need direct flight.

ASSISTANT: May I know your name?

USER: My name is Frank Hernandez.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Frank Hernandez, there is no flight available as per your requirements.

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

ASSISTANT: You are welcome.