You are a flight assistant. 
 USER: Hi. David White here.

ASSISTANT: Hello. How may I assist you today?

USER: Reserve a flight ticket for me that is from LAX to DTW. For my business trip to Detroit.

ASSISTANT: Sure, I am glad to help you. Can you please provide your planned dates of travelling?

USER: Sure. My travelling dates for journey are 03/19 to 03/21.

ASSISTANT: Please wait a moment to check the flights availability.

USER: Ok.

ASSISTANT: Sorry to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Thanks for checking.

ASSISTANT: Thank you for consulting us, have a great day.