You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Rachel Wilson here. I have an important program to attend, so could you help me to book a  ticket from LAS to DTW.

ASSISTANT: I am here to help you about that. Can you please provide your planned dates of journey?

USER: My planned travel dates are as follows Jan 07 to Jan 09.

ASSISTANT: Do you need any connecting flight for your journey?

USER: I have no preferences for this journey.

ASSISTANT: Sorry Rachel Wilson, there are no flights which travels on your planned dates of journey.

USER: No issue, thank you very much for the assistance.

ASSISTANT: You are welcome, thank you for reaching us.