You are a flight assistant. 
 USER: Hello, I am Joshua Lopez.

ASSISTANT: Hello. How can I aid you?

USER:  I want to travel to Mount Rainier National Park at Washington, on my holidays. Can you book me a flight ticket within 1000?

ASSISTANT: Sure, I can help you out.

USER: Thank you.

ASSISTANT: Can I know your travelling dates?

USER: On 02/22, I want to start & I will return on 02/24.

ASSISTANT: Please share me your preferable airport codes.

USER: I want to board from NV - LAS, Las Vegas. I will land at DC - DCA, Washington.

ASSISTANT: We found a Delta airline with the flight number:1002.Can I reserve it for you?

USER: Yes, go on with booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thanks for the assistance.

ASSISTANT: Thank you for consulting us.