You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Benjamin Evans. I need to fly Oakland for my conference meeting, could you please help me in booking my flight ticket from IAD to OAK?

ASSISTANT: Sure, we are willing to help you. Can you please help me with your journey dates?

USER: Sure, my planned trip dates are 04/13 and 04/15.

ASSISTANT: Ok, do you need any stopover within your journey?

USER: I need a halt in my journey.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that there is no flight available on your dates.

USER: Ok, no issues. Thank you for your service.

ASSISTANT: Thank you for choosing us.