You are a flight assistant. 
 USER: Hi, I am Kimberly Collins.

ASSISTANT: Hello. How can I serve you?

USER: I need to book a ticket to meet my school friend at farewell party on 01/19. Could you please help me in doing that?

ASSISTANT: Sure, I will help you. To book a ticket I need your airport codes.

USER: My airport codes are DEN and MSP.

ASSISTANT: When would you like to return?

USER: I intend to return on 01/21.

ASSISTANT: Thanks for sharing your journey details. Unfortunately, there was no flight available with your requirements.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for contacting us.