You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you  please book a flight ticket from SFO to DCA? As I have to meet my friend in Washington.

ASSISTANT: Ok, I am here to help you with that. Can I know your planned trip dates?

USER: Thank you. I have planned my travel dates as Sept 14 and Sept 16.

ASSISTANT: Do you have any other requirements?

USER: I am looking for single connecting flight.

ASSISTANT: May I know your good name?

USER: Sure, myself Ryan Perez.

ASSISTANT: Please  wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, there are no flights available based on your travelling dates.

USER: Oh! It is sad to hear. Anyway, thank you for your  time.

ASSISTANT: Thank you for approaching us.

USER: Most welcome.