You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER:  I am looking for a flight which depart on afternoon to LAS. Can you please help me for booking?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My preferred dates are on March 14 and 16.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes.

ASSISTANT: Can you please share your source airport code?

USER: I am boarding from LGA.

ASSISTANT: Please share your name.

USER: Andrew Harris is my name.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, thank you.

ASSISTANT: Thanks for reaching us.