You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I want to attend a burial service at Houston, help me in booking my flight ticket from CO-DEN to TX-HOU.

ASSISTANT: Sure, May I know the travel dates?

USER: I would be start on 05/21, my return date is 05/23.

ASSISTANT: May I know your name?

USER: I am Gregory Hill.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Its ok, thank you for your assistance.

ASSISTANT: Thank you for reaching us.