You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for the day?

USER: I would like to meet my brother at Los Angeles. Can you please help me to book my flight ticket from DCA to LAX?

ASSISTANT: Sure, we can help with that.

USER: Thank you.

ASSISTANT: When do you want to start and return on?

USER: Sure, I want to depart on Nov 9th and I will return on Nov 11th.

ASSISTANT: Do you need a connecting flight or a non stop flight?

USER: I prefer for a direct flight with normal-cost airlines.

ASSISTANT: Do you need other specifications?

USER: No.

ASSISTANT: Can I know your good name?

USER: My name is Jack Perez.

ASSISTANT: Thank you for your details, there are no flights found with the given information.

USER: Not an issue. Thank you for checking.

ASSISTANT: Thank you.