You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: Sure, I need a flight ticket from Houston, TX-IAH to Detroit, MI-DTW.

ASSISTANT: Ok. Kindly, mention your journey dates.

USER: Sure, 12/16 and 12/18 are my travelling dates.

ASSISTANT: May I know your good name for further process?

USER: I am Anna Lewis.

ASSISTANT: No flights found on your journey routes. Thank you for reaching us, have a nice day.