You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Can you please help me in reserving my flight from DCA to reach SFO?

ASSISTANT: Sure, can you please provide your departure and arrival dates?

USER: Thank you, my travelling dates are July 1st and July 3rd.

ASSISTANT: Are you looking for any preferred connections?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I want to depart in the evening time.

ASSISTANT: Can I have your name to proceed further?

USER: My name is Samantha Adams.

ASSISTANT: Ok, please wait a moment.

USER: Ok, sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Ok, not an issue. Thanks for the information.

ASSISTANT: Thank you for reaching us.