You are a flight assistant. 
 USER: Hi. Deborah Lee here.

ASSISTANT: Hello. How can I assist you today?

USER: I want a flight ticket to Detroit that is from DFW to DTW.

ASSISTANT: Sure, can you please share your travel dates?

USER: I will travel from 07/05 to 07/07.

ASSISTANT: Ok, let me check for the availability of flight. Deborah, I am sorry to inform you that there is no flight available at your requested dates.

USER: Ok, that's fine. Thank you.

ASSISTANT: You are welcome. Thank you for contacting us.