You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Richard Perez here.

ASSISTANT: Perez, how may I help you?

USER: I would like to visit the beauty of Oakland, can you book a ticket from BOS to OAK?

ASSISTANT: Sure, please share your itinerary dates.

USER: Sure, my itinerary dates are from 08/20 to 08/22.

ASSISTANT: Please hold on for a while.

USER: Ok, sure.

ASSISTANT: Sorry, no flight is available.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you so much.