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 DCA to reach SFO?

ASSISTANT: Sure, when would you like to travel?

USER: My preferable dates are on June 3rd to 5th.

ASSISTANT: May I know your name for the booking process?

USER: My name is Stephen Hill.

ASSISTANT: Do you have any preferences?

USER: I would like to return in afternoon time.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.