You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: My name is Andrew Baker, I want to book a direct flight to attend meeting with company share holders. Can you help me with booking?

ASSISTANT: Sure, I will help you with that. May I know your airport codes please?

USER: My source point is DCA and my destination is SFO.

ASSISTANT: Ok, can you please share your trip dates?

USER: I need a flight on 17th June and return flight on 19th June.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.