You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ronald Nelson here.

ASSISTANT: How can I help you?

USER: I want to go to Houston to attend a seminar, can you book a ticket from SEA to HOU?

ASSISTANT: May I know your travelling dates please?

USER: Sure, my trip dates are from 02/08 to 02/10.

ASSISTANT: I am sorry no flights available on your route?

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.