You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Christine Perez, want to travel from DEN to SEA. Please help me in booking my ticket.

ASSISTANT: Can I know your travel dates?

USER: Sure, my travelling dates are from 08/13 to 08/15.

ASSISTANT: Sorry Perez, there is no flight available on your requested dates.

USER: It's ok, not an issue. Anyway, thank you for your help.

ASSISTANT: You are welcome.