You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am Brandon King. I am planning to travel Phoenix, can you help me in booking flight from Washington?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: When you are willing to travel?

USER: I like to travel on Nov 4 to Nov 6..

ASSISTANT: Can you help me with your airport codes?

USER: My airport codes are DCA to PHX.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.