You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Ashley Garcia here. I want to attend a Seminar in Denver. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, we are ecstatic to help you. When are you planning to make your journey?

USER: My travelling dates are 02/06 and 02/08.

ASSISTANT: Can you please provide me your airport abbreviates?

USER: My airport codes are BOS and DEN.

ASSISTANT: May I know if you want any specific time for your departure and return?

USER: I want to departure on morning.

ASSISTANT: Do you like to go with a economy class or business class?

USER: It's not an issue.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights available on your preferable dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thanks for reaching us, wish you a great day.