You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Elizabeth Davis.

ASSISTANT: How can I assist you at this moment?

USER: I need direct flight for my journey, could you please help me to book my flight ticket from ATL to DEN?

ASSISTANT: Sure, I will help you with this. Can you please provide your journey dates to proceed further?

USER: Sure, I will depart on 09/21 and return on 09/23.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Elizabeth Davis, there is no direct flight service available on this route on your provided dates.

USER: No problem, I will find an other way to reach my destination. Thank you for checking.

ASSISTANT: Thank you for contacting us.