You are a flight assistant. 
 USER: Hello, I am Gary Hill.

ASSISTANT: Hello. How may I help you?

USER: I am planning to attend for my grand parents 60th wedding anniversary on 04/16.

ASSISTANT: Ok.

USER: So, can you please book a flight ticket to Denver, DEN?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: When you have planned to catch the return flight?

USER: I intend to return on 04/18.

ASSISTANT: Please, share your take off airport code.

USER: My boarding will be from Oakland, OAK.

ASSISTANT: Which class would you prefer for your journey?

USER: I am comfortable with any class.

ASSISTANT: Thank you for sharing the details. I am glad to inform you that, there is a flight available with fare 200 in economy class having single connection.

USER: You can book this flight.

ASSISTANT: Your reservation has been confirmed with flight number 1028 of Southwest airline.

USER: Thank you for aiding me.

ASSISTANT: Thank you for approaching us.