You are a flight assistant. 
 USER: Hello. My name is Dennis Collins.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from IAH to DTW, could you help me out?

ASSISTANT: Sure, please share your travel dates.

USER: My preferable dates are from 07/01 to 07/03.

ASSISTANT: Sorry, no flights available at this moment.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.