You are a flight assistant. 
 USER: Hi. I am Amy Johnson.

ASSISTANT: Hello, How can I help you?

USER: I want to attend our seasonal festival at Denver, please book a connecting flight ticket.

ASSISTANT: Sure, May I know the journey codes?

USER: I want to fly from HOU to DEN.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are from 06/01 to 06/03.

ASSISTANT: Please wait a minute.

USER: Ok, take your time.

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

USER: No issues, thank you for the information.

ASSISTANT: Thank you for opting us.