You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I aid you today?

USER: This is Charles Robinson from Las Vegas.

ASSISTANT: Ok.

USER: I would like to visit one of the park in Washington with my grand mother as my doctor prescribed me to go for a change. Could you please aid me in booking a flight ticket?

ASSISTANT: Sure, we are here to aid you. When you will start your journey to reach Washington?

USER: I will start my journey from Las Vegas on 05/13.

ASSISTANT: Ok. To proceed with further booking I need your source and destinations codes.

USER: My source code is NV-LAS and destination code is DC-DCA.

ASSISTANT: Let me know your arrival date.

USER: I intend to arrive on 05/15.

ASSISTANT: Thanks for sharing your details. There is a flight found with direct flight in Spirit airline with a halt. Could I proceed?

USER: You can proceed.

ASSISTANT: Reservation is done with flight number 1026 and ticket costs you 200.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us. Have a nice day.