You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am planning to book a ticket from BOS to LAX. Can you please help me out?

ASSISTANT: Sure, please share me your trip dates.

USER: I am planning to travel on July 18 and return back on July 20.

ASSISTANT: Do you need any specifications?

USER: Yes, I need a direct flight which depart in evening time.

ASSISTANT: May I know your airline preferences?

USER: I am looking for a normal cost airline.

ASSISTANT: For booking, we need your good name. Please provide it.

USER: I am looking for a economy class, can you check on the name of Nicole Davis.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for communicating with us.