You are a flight assistant. 
 USER: Hi Ryan Carter here.

ASSISTANT: Hello, how can I support you today?

USER: I am going to meet my parents after a long time in Washington DC - IAD. Can you book a flight ticket for me?

ASSISTANT: Sure, please provide me your journey dates and origin airport details?

USER: Sure, I want to start on 11/14 and end on 11/16. And my origin airport code is CA - SFO.

ASSISTANT: OK, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any flights are available on your details.

USER: Ok, no issues. Thanks for your assistance.

ASSISTANT: Thank you, have a nice day.