You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me to book a flight from SFO to DCA?

ASSISTANT: Can I know your travelling dates?

USER: I want to travel on Aug 12 and need to return on Aug 14.

ASSISTANT: Do you have specification?

USER: I am looking for a flight with single connection.

ASSISTANT: Can I know your name?

USER: Myself Deborah Turner.

ASSISTANT: Sorry, there is no flight with your travelling dates.

USER: Ok, not an issue.

ASSISTANT: Thanks.

USER: Thank you for the information.