You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Carolyn Wright here. I have a seminar in Boston.Can you please help me for booking a ticket?

ASSISTANT: Ok, may I know your airport codes?

USER: My airport codes are from CA-OAK to MA-BOS.

ASSISTANT: Can you please provide me your travelling dates?

USER: My departure date is 08/17 and return date is 08/19.

ASSISTANT: Sorry, there is no flight available.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us. Welcome, have a nice day.