You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: Please help me in booking flight ticket from DEN to SEA.

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: My trip dates are Aug 26 to Aug 28.

ASSISTANT: Ok, may I know your good name?

USER: Ashley Gonzalez.

ASSISTANT: Do you have any other requirements?

USER: My depart should be in afternoon.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.