You are a flight assistant. 
 USER: Hello, I am Timothy Lee.

ASSISTANT: Hello, How can I help you?

USER: I want to fly from DFW to JFK to meet my friend, can you please book a flight ticket?

ASSISTANT: Sure, when did you planned to travel?

USER: My trip dates are 11/20 to 11/22.

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

USER: I need a direct flight.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry, there were no flights found with your given details.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thanks for contacting us.