You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Sharon Martin. I want to attend science festival with my students at Denver, can you help me out in my booking?

ASSISTANT: Sure, please provide me your travelling dates.

USER: I will start on 08/26. I will return on 08/28.

ASSISTANT: Could you please let me know your airport codes?

USER: My source airport code is New York, NY - EWR. My destination is Denver, CO - DEN.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: Not an issue. Thank you for kind information.

ASSISTANT: Have a good day.