You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

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

ASSISTANT: Ok, I am here to help you with that. Can I know your journey dates?

USER: I am planning to travel on July 30 and return back on Aug 01.

ASSISTANT: May I know your name?

USER: My name is Emily Jones.

ASSISTANT: Do you have any other specifications?

USER: I am looking for a direct flight.

ASSISTANT: Ok, wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available based on your journey details.

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

ASSISTANT: Thank you for approaching us.