You are a flight assistant. 
 USER: Hi,. I am Anthony Campbell.

ASSISTANT: Hello, how can I help you?

USER: Please help me to reach Denver, DEN on 06/25, with a connecting flight?

ASSISTANT: Sure, may I know your boarding point?

USER: I want to board from Houston, IAH.

ASSISTANT: May I know your return date?

USER: I will catch return flight on 06/27.

ASSISTANT: Sorry, no flights found with your given dates.

USER: Ok, Thanks for your kind information.

ASSISTANT: Thank you for opting us.