You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Anthony Harris here, I need to fly to DCA to launch new product. Could you please help me to book a ticket with single connection?

ASSISTANT: Sure, I will be blissful to help you. May I know your source code?

USER: My source is SFO.

ASSISTANT: Please share me your travelling dates?

USER: My travelling dates will be on 10/21 to 10/23.

ASSISTANT: Do you have any price limit?

USER: Fare is 500.

ASSISTANT: Please wait for a while, let me check and back to you.

USER: Ok.

ASSISTANT: We are sorry to inform, there is no connecting flight.

USER: Not an issue, thank you.

ASSISTANT: Thank you for choosing us.