You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you for today?

USER: I want to book a flight from LAX to LAS. Can you please help me with the booking?

ASSISTANT: Sure, may I know your travel dates?

USER: Sure, I want to start my journey on Dec 9 and need to end it on Dec 11.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: No.

ASSISTANT: Do you have any limits on number of connections?

USER: Yes, I am looking for a flight with single connection.

ASSISTANT: Thank you, may I know your name for the documentation purpose?

USER: My name is Brenda Anderson.

ASSISTANT: Do you have any airline preference?

USER: Yes, I prefer a normal-cost airline.

ASSISTANT: Do you have any class specification on this journey?

USER: No.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: Ok, no problem.

ASSISTANT: Welcome, thank you for reaching us.

USER: Thank you for the information.