You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Scott Anderson want to visit Phoenix Zoo, can you help me to book a ticket on 06/12 and 06/14?

ASSISTANT: Please share your itinerary dates. May I know your airport codes?

USER: Sure, I want to fly from OAK to PHX.

ASSISTANT: Please hold on.

USER: Ok.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.