You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Matthew Roberts. I need to book a flight ticket from DTW to IAH, Can you please help me for booking?

ASSISTANT: Sure, I am here to help you to book a flight but I need your travel dates.

USER: I would like to travel on 12/04 to return on 12/06.

ASSISTANT: Sorry, I could not find any flight with your travelling dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: My pleasure.