You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I am William Gonzalez. I want to book a flight ticket from WA-SEA to CO-DEN. Can you help me?

ASSISTANT: Sure, Please help me with your travel dates.

USER: 06/26 and 06/28 are my travelling dates.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No issue. Thank you for your help.

ASSISTANT: Thank you for opting us.