You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: I am Mark Thomas. I want to book a ticket from DTW to DFW, can you help me?

ASSISTANT: Sure, can you share your trip dates?

USER: My travel dates are June 04 and 06.

ASSISTANT: Do you have any preferences?

USER: I want to return in the evening.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.