You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Frank White. I am planning to book a ticket to meet my family at SFO. Can you please help me out?

ASSISTANT: May I know your desired travel dates please?

USER: I am planning to travel on 09/30 and 10/02.

ASSISTANT: Please share your destination airport code.

USER: My source code is IAH.

ASSISTANT: There is no flight available on your desired travel dates.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for choosing us.