You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Charles Phillips. I want to attend a function in Washington.Can you please help me for booking a flight ticket?

ASSISTANT: Sure Charles, can I know the travel dates please?

USER: My departure date is 06/09 and return date is 06/11.

ASSISTANT: Can you provide the travelling codes please?

USER: My airport codes are from AZ-PHX to DC-DCA.

ASSISTANT: Give me a moment I will get back to you.

USER: Make sure my connections limit is 0.

ASSISTANT: Sorry to inform you Charles, there are no flights with your details. Thank you for reaching us, have a good day.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome.