You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Samuel Green.

ASSISTANT: How may I aid you?

USER: I just need your help in booking a plane ticket from PHX to IAD.

ASSISTANT: Sure, can I have your journey dates please?

USER: Sure, my planned journey dates are from 11/16 to 11/18.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, no flights has been found on your journey dates.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.