You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Thomas Martinez. I want to book a flight ticket from DTW to DEN. Could you help me in booking?

ASSISTANT: Please mention your travelling dates?

USER: My travelling dates are from April 11-13.

ASSISTANT: There are no flights running on your route, due to bad weather forecast.

USER: That's ok, no problem.

ASSISTANT: Thank you for reaching our service.

USER: Thank you.