You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I assist you today?

USER: Please book a ticket from Detroit, MI-DTW to Houston, TX-IAH.

ASSISTANT: Sure, could you please mention your journey dates?

USER: My journey dates are from 09/22 to 09/24.

ASSISTANT: May I have your name please?

USER: I am Alexander Martin.

ASSISTANT: Sorry to say that, no flights were found on your route.

USER: Thank you.

ASSISTANT: Thank you for reaching us.