You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I would like to visit the Carolinas Aviation Museum at Charlotte. can you book a ticket from Oakland?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travelling airport codes?

USER: My source is OAK and destination is CLT.

ASSISTANT: On which dates you want me to book your tickets?

USER: I want to travel on Aug 28 and return on Aug 30.

ASSISTANT: Can you please tell me your name?

USER: My name is Kevin Clark.

ASSISTANT: Do you have any specification?

USER: I want to depart in the afternoon. And I prefer an economy class.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, no problem. Anyway thank you for your information.

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