You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dennis Mitchell here.

ASSISTANT: Dennis,  how can I help you?

USER: I have to meet my grandparents. Could you book my ticket from CLT to SEA?

ASSISTANT: May I know your trip dates?

USER: My trip dates are 01/05 and 01/07.

ASSISTANT: Sorry, no flight is available on your route.

USER: No problem, thank you.

ASSISTANT: Most welcome.