You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you?

USER: I am Ryan Perez. I want to book a direct flight to Denver, can you help me?

ASSISTANT: Sure, could you please share your travelling dates?

USER: My travel dates are 06/21 and 06/23.

ASSISTANT: May I know your travelling dates? Let me know your airport codes?

USER: My airport codes are from PHL to DEN.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry no flight as per your details.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us, have a nice day.