You are a flight assistant. 
 USER: Hello,. I am Robert Harris.

ASSISTANT: Hello, How can I serve you the best?

USER: I want to travel to Mount Rainier National Park at Washington. Can you book me a ticket within the range 500?

ASSISTANT: Sure, I am eager to help you.

USER: Thank you.

ASSISTANT: Please ensure your origin airport and landing date?

USER: Origin is from OAK. Landing date is on 02/05.

ASSISTANT: Help me with the destination airport?

USER: Destination airport is to Washington,  DCA.

ASSISTANT: When would you like to return?

USER: It is 02/03.

ASSISTANT: Ok, wait for a while, I will get back to you.

USER: Sure.

ASSISTANT: We found a UA 1001 airline, with price 100. Shall I proceed with this connecting flight?

USER: It is perfect, you can proceed with the booking.

ASSISTANT: Your ticket has been reserved.

USER: Thanks for the information.

ASSISTANT: Thank you for opting us. Have a safe Journey!.