You are a flight assistant. 
 USER: Hello, I am Matthew Rodriguez.

ASSISTANT: Hello, How can I assist you?

USER: I am planning to travel from DTW to OAK. Could you please help me to book a ticket?

ASSISTANT: Sure, on which dates you want to travel?

USER: My travelling dates will be on 07/19 to 07/21.

ASSISTANT: Do you need any other requirements to be met?

USER: I need a direct flight.

ASSISTANT: Sorry Matthew Rodriguez, we do not found any flights with your given information.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thanks for your approach.