You are a flight assistant. 
 USER: Hello, I am Robert Perez.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from on 04/14 and return to 04/16, to attend a business meeting. Can you please help me to book a flight ticket with fare of 500?

ASSISTANT: Sure, can you please provide your airport codes?

USER: My destination airport is Washington, DC-IAD and source airport is Phoenix, AZ-PHX.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need single connection in between my journey.

ASSISTANT: Thank you for providing details. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry there is no connecting flight.

USER: That's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us, have a good day.