You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want book a ticket from OAK to DTW, to meet my brother on his birthday.

ASSISTANT: Sure, please provide your trip dates.

USER: I would like to travel on 04/04 and 04/06.

ASSISTANT: Please hold on for a while.

USER: Sure.

ASSISTANT: May I know your name?

USER: Sure, I am Daniel Thomas.

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

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

ASSISTANT: Thank you for contacting us.