You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello,. How may I assist you?

USER: I am Virginia Collins.

ASSISTANT: Ok.

USER: I want to book a flight ticket to attend a board meeting on 05/02 .So, my travelling dates would be 05/01 and 05/03. Can you help me?

ASSISTANT: Ok. Please provide your travel codes?

USER: Sure, DEN and LAS are my comfortable airport codes.

ASSISTANT: Please specify connections limit?

USER: I need a connecting flight.

ASSISTANT: No flight found for your requirement.

USER: No issue.

ASSISTANT: Thanks.

USER: Thank you for your help.