You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Nicholas hall here. Reserve a flight ticket that is from DTW to ORD.

ASSISTANT: How may I help you today? I will help you with that.\. Can you please share your journey dates?

USER: My preferable dates for travel are 01/27 to 01/29.

ASSISTANT: Give me a minute. I am sorry to say that there is no flight found.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.