You are a flight assistant. 
 USER: Hi. I am Carol Thompson.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me with booking a flight ticket from DEN to SEA?

ASSISTANT: May I know your travel dates?

USER: Travel dates are 04/28 and 04/30.

ASSISTANT: Do you have any requirements?

USER: I would like to return at afternoon.

ASSISTANT: Sorry, there is no flight found with your requirements.

USER: OK, no issues. Thanks for the help.

ASSISTANT: Thank you for reaching us.