You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Larry Gonzalez. I would like to travel from DTW to DFW for a urgent meeting, could you help me in making a reservation?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Sure, my preferable dates are from 11/18 to 11/20.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your preferable details.

USER: That's ok. Thank you for your time.