You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jerry Williams.

ASSISTANT: Jerry, how may I assist you?

USER: Can you book a ticket from SEA to DEN?

ASSISTANT: Sure, I will be happy to help you. Can you please provide me your travel dates?

USER: Ok, my travelling dates are 01/30 and 02/01.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Jerry, there is no flight available on your preferred travel dates.

USER: It's ok, thanks for your information.

ASSISTANT: You are welcome and thank you for choosing us.