You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Justin Smith.

ASSISTANT: How may I assist you?

USER: I want to travel from DEN to OAK. Can you help me to book a flight ticket?

ASSISTANT: Sure, I will help you. Can you please share your planned travel dates?

USER: I want to fly in the flight on 02/07 and 02/09.

ASSISTANT: Please wait a moment.

USER: I am looking for a direct flight.

ASSISTANT: Justin, no flights has been found on your journey dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for approaching us.