You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Helen Garcia.

ASSISTANT: How can I help you at this moment?

USER: I want to book a flight ticket from CO-DEN to TX-AUS. Can you help me?

ASSISTANT: Sure. Can you please mention your preferable travel dates?

USER: Thank you. 07/15 and 07/17 are my travelling dates.

ASSISTANT: Is there any additional preferences do you have?

USER: I need a connecting flight.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry no flights are available in this route as per your requested dates.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.