You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Catherine Perez. Can you help me in booking from DEN to SEA?

ASSISTANT: May I know your desired travel dates please?

USER: My trip dates are 09/11 to 09/13.

ASSISTANT: There is  no flight on your desired travel dates.

USER: No issue, thank you.

ASSISTANT: Thank you for opting us.