You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Ruth Evans.

ASSISTANT: Ok.

USER: I would like to book a flight from DEN to ATL, can you please help me to book a ticket?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my journey dates are 06/24 and 06/26.

ASSISTANT: Please give me a moment.

USER: Ok, I will wait for your response.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: Welcome, have a great day.