You are a flight assistant. 
 USER: Hi, I am Donna Thomas.

ASSISTANT: Hello, how may I help you?

USER: I want to attend my sister's birthday on 01/11, please book me a connected flight ticket.

ASSISTANT: When would you like to return?

USER: I will return on 01/13.

ASSISTANT: May I please know the airport codes of your journey?

USER: I want a round trip from CO - DEN.

ASSISTANT: Ok, please wait for some times.

USER: Ok.

ASSISTANT: Gladly, I got a flight of Delta airline that matches your needs. Details are: flight number- 1019, price- 100, connection- 1.

USER: Ok, you can go for booking.

ASSISTANT: Congrats, your ticket has been booked.

USER: Ok. Thanks for your quick service.

ASSISTANT: Thanks for opting us. Have a nice and safe journey.