You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I am Brian White. I am looking for a flight from ORD to DTW, can you help me out?

ASSISTANT: May I know your journey dates?

USER: My trip dates are from Mar 18th till Mar 20th.

ASSISTANT: Please wait a moment.

USER: I need to take off my flight in evening.

ASSISTANT: Sorry, there are no flight tickets available on your journey dates.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching our service.